“What Causes a Subchorionic Hemorrhage in Early Pregnancy” — What is the real cause of bleeding in early pregnancy?

Nusrat Ayaan

Published: 11/06/2026
Updated: 11/06/2026

 “what causes a subchorionic hemorrhage in early pregnancy” — bleeding between uterus and placenta, causes, risks, symptoms, and safe management explained simply.

Any mother’s heart trembles when she sees sudden bleeding in the beginning of pregnancy. It seems – what happened? Has the baby been harmed?

what causes a subchorionic hemorrhage in early pregnancy

This fear is normal. But you will be surprised to know – one of the major causes of this bleeding in the beginning of pregnancy is a condition called “subchorionic hemorrhage”. It is not scary, but if you know the right information, it can be easily managed.

So, let’s find out in very simple language – what this problem actually is, why it happens, and how to deal with it.

What does subchorionic hemorrhage actually mean?

In the womb, the baby is in a sac called the amniotic sac. The outer covering of this sac is called the chorionic membrane. When blood accumulates between this chorionic membrane and the uterine wall, it is called “what causes a subchorionic hemorrhage in early pregnancy” — that is, subchorionic hemorrhage or hematoma.

Simply put — a small gap forms between the placenta and the uterine wall and blood accumulates there, forming a small pocket of blood. This is subchorionic hemorrhage.

How common is it?

But it is not a rare occurrence at all. Subchorionic hemorrhage occurs in about 1 to 3 percent of all pregnancies, and it is most common in the first trimester of pregnancy. So there is nothing to be afraid of if you see it.

Why does this bleeding occur in early pregnancy — what are the real causes? 

Now let’s come to the most important question — “what causes a subchorionic hemorrhage in early pregnancy” i.e. what is the root cause of this problem?

The truth is, doctors themselves can’t always say for sure why it happens. However, scientists have identified some causes and risk factors.

Blood vessel rupture during implantation

In the very beginning of pregnancy, when the embryo attaches itself to the uterine wall (implantation), some small blood vessels can rupture. At this time, the implantation of the embryo into the uterine wall can cause small blood vessels to rupture, causing bleeding between the uterus and the developing placenta.

Think of it in a simpler way — when a new plant puts down roots in the ground, the soil is moved a little. Similarly, a baby can bleed a little as it establishes itself in the uterus.

Are rapid hormonal changes to blame?

Early pregnancy, hormone levels change very rapidly, which can weaken the normal structure of blood vessels and increase the risk of bleeding. Yes, hormones can also be a factor in this problem.

Structural problems of the uterus

The internal structure of the uterus is slightly different in some women from birth, while others develop this problem later for some reason. Structural defects of the uterus, a history of repeated miscarriages, or pelvic infections — these are considered possible prerequisites for subchorionic hemorrhage.

Is there a higher risk of pregnancy with IVF? 

This problem is more common in those who have conceived with IVF or test tube methods. This is because the uterine wall can be put under slight pressure during the artificial embryo transfer.

Blood clotting problems and other diseases 

Blood clotting problems, being antiphospholipid antibody positive, low levels of protein S and antithrombin III, and increased homocysteine ​​— all of these increase the risk of this problem.

In simple terms — those who do not clot properly or have problems with their immune system are more likely to develop this problem.

Who is at higher risk of developing this problem?

“what causes a subchorionic hemorrhage in early pregnancy” — It is important to know not only the causes, but also the risk factors. See the table below —

Risk factorsDetailed
History of recurrent miscarriageThe risk increases if you have had multiple miscarriages in the past.
Structural problems of the uterusIf there is any abnormality in the shape of the uterus
Pelvic infectionIf there has been a previous infection in the uterus or fallopian tubes
High blood pressureIf you have high blood pressure before pregnancy
IVF methodIf you conceive through artificial means
Blood clotting disordersIf you have thrombophilia or similar blood disorders
Pregnancy at an older ageThe risk may increase slightly if the mother is older.

How to understand the symptoms of subchorionic hemorrhage? 

There are many mothers who have had this problem, but did not feel anything. Many others have suddenly seen bleeding and cried in fear. In fact, the symptoms of this problem are not the same for everyone.

It’s important to understand your own body language. Don’t just stay at home if you notice any unusual symptoms — seek professional advice as soon as possible.

Vaginal bleeding — how normal is it? 

Mothers start to tremble with fear at the sight of a little blood in their three-month-old womb — this fear comes from deep within the heart. This bleeding can sometimes be light pink, sometimes reddish or brown. In the case of subchorionic hemorrhage, the bleeding is usually light, but in some cases it can be a little more.

Always keep one thing in mind – whether you have a lot or a little blood, tell your doctor as soon as you see it. The most dangerous thing is to think, “What will happen if this happens?”

What to do if you feel pain or pressure in the lower abdomen? 

Some mothers may occasionally feel a pressing pain or a slight pulling sensation in their lower abdomen.It may feel like period pain. However, if the pain is severe or increases suddenly, then it should be taken seriously.

Can there be a problem even if there are no symptoms?

Yes, this is the biggest issue. Many mothers do not have any symptoms. They find out that there is blood clots during a routine ultrasound. This is why regular ultrasounds are so important during pregnancy.

“what causes a subchorionic hemorrhage in early pregnancy” — In addition to knowing the answer to this question, it is equally important to know the symptoms, because even if there are no symptoms, there may be a problem.

How is this problem detected on ultrasound? 

How will the doctor know that you have this problem? Knowing a little about what tests the doctor performs makes it easier for mothers to understand.

Ultrasound is the main test 

The most reliable way to diagnose subchorionic hemorrhage is ultrasound. It clearly shows the inside of the uterus and can understand where the blood has accumulated, how much space it covers.

A small hematoma means less risk. If the hematoma is large, the doctor is a little more careful and monitors it frequently.

Does the size and location of the blood matter? 

Yes, it is very important. If the amount of accumulated blood occupies more than 25 percent of the space of the gestational sac, then the risk is slightly higher. And if the blood accumulates behind the placenta, it is a matter of paying a little more attention.

However, in most cases, the amount of blood is small and the body gradually absorbs it itself.

HCG hormone level test 

In addition to the ultrasound, the doctor can also check the amount of HCG hormone in the blood.The level of this hormone can be used to understand whether the pregnancy is progressing properly. 

“What causes a subchorionic hemorrhage in early pregnancy” — This is not just one question, but doctors perform several tests together to find the answer.

Does this problem harm the baby? How much is the risk? 

This is the biggest question for mothers. The simple answer is — in most cases, the baby is not harmed and the pregnancy proceeds normally.

However, there are some precautions in some cases —

  • If the size of the hematoma is large, the risk of miscarriage may increase slightly
  • There may be a possibility of premature birth
  • There is a risk of placental abruption
  • High blood pressure may occur towards the end of pregnancy
  • The baby may be born with a lower weight than normal
  • However, these risks are not the same for everyone.

It is possible to reduce these risks to a great extent by visiting a doctor regularly and taking proper care.

So when is there really a reason to worry? 

If any of the following symptoms appear after a hemorrhage is detected, go to the hospital immediately —

  • Sudden heavy bleeding
  • Severe pain in the lower abdomen
  • Dizziness or fainting
  • Fever
  • Decreased baby’s movement

More important than knowing “what causes a subchorionic hemorrhage in early pregnancy” — is knowing when the danger signals are coming.

Treatment and care — What does the doctor do, what should the mother do? 

There is no specific treatment for this problem. The doctor takes action based on the mother’s condition.

Rest and reduce physical exertion 

The doctor usually recommends pelvic rest.Simply put, you should not put too much pressure on your body, you should refrain from sexual intercourse, and you should also give up the habit of standing or walking for long periods of time during this time.

Does progesterone medication work? 

Doctors sometimes prescribe progesterone suppositories for mothers who have had a previous miscarriage and are bleeding this time. However, this method is not applicable to all mothers, and scientists are still trying to find out how well it actually works.

Regular ultrasound and follow-up 

“what causes a subchorionic hemorrhage in early pregnancy” — The biggest treatment in this situation is regular monitoring. The doctor will do an ultrasound every month or more frequently if necessary to see if the bleeding is decreasing and the baby is growing normally.

How to stay healthy at home — Practical advice for mothers

After returning home from the hospital after being diagnosed with subchorionic hemorrhage, mothers often ask a question — what should I do now? The doctor said to rest, but what else should I do?

Let’s try to answer those urgent questions — as simple as a chat in a tea shop.

Maintain proper eating and drinking habits

To keep the body healthy, the first thing you need is nutritious food. The body works a lot during pregnancy, so you cannot neglect your diet at all.

Drink enough water every day. Eat vegetables, pulses, eggs, milk, fish — eat these regularly. Avoid fried and spicy foods as much as possible.If the body is healthy, it can slowly drain the accumulated blood on its own, without having to do anything from the outside.

Why is it so important to reduce stress?

There are many mothers who have been worrying all the time since hearing this news. They cannot sleep. They repeatedly think — will something happen to the baby?

This stress is also harmful to the body. Excessive anxiety increases the cortisol hormone in the body, which is not good for pregnancy. So talk to people close to the family. There is no harm in crying openly, but do not be alone in fear.

Stay away from heavy work and exertion

Mothers in villages often say — “What will happen if I work a little?” But you really need to be careful at this time.

Heavy loads cannot be lifted. You cannot climb stairs quickly. Avoid working in the field or walking for long periods. Give your body rest — this is the biggest medicine at this time.

Conclusion

The fear that arises in the minds of mothers when they see bleeding in the early stages of pregnancy is completely normal. But if you have the right knowledge about “what causes a subchorionic hemorrhage in early pregnancy” — that fear is greatly reduced.

Subchorionic hemorrhage does not mean danger. It is a known problem that has been seen in thousands of mothers during their pregnancies and they have given birth to healthy children. This problem basically occurs when the chorionic membrane becomes slightly loose from the uterine wall and blood accumulates there. Tearing of blood vessels during implantation, rapid hormonal changes, structural problems of the uterus or blood clotting diseases — these can be behind this problem.

The most important thing is — do not sit and think alone. Follow the doctor’s advice, get regular checkups, eat nutritious food and keep your body and mind calm. Your body is very strong — it often heals this problem itself.

“What causes a subchorionic hemorrhage in early pregnancy” — Find out the answer to this question, be aware, and help pregnant mothers around you know this information. Because only the right information can make a mother’s life easier.

Related Articles

which organ develops and is fully functional in the first trimester?

Which Organ Develops and Is Fully Functional in the First Trimester? Completed guidelines

 “Which organ develops and is fully functional in the first trimester?” The answer is the heart — it beats by week 3 and keeps the embryo alive throughout early pregnancy.

The heart is the first organ to develop and become fully functional in the womb. This miracle happens in the first few weeks of pregnancy.

When life begins to flow little by little in the mother’s womb, the heart starts moving first. Many people think that the head or lungs may be formed first, but scientists have found that the situation is actually completely different. The first heartbeat comes out of the baby’s heart just three weeks after it is born.

In medical terms, these first three months are called the “First Trimester”. Have you ever thought about how important these three months are?At this time, a little wrong decision or negligence on the part of the mother can leave an impression on the child’s entire life. Therefore, every person in the family, especially the pregnant mother, should know this well.

What actually happens to a baby’s body in the first three months?

The first trimester is said to be over when the first twelve weeks of pregnancy are over. During these few weeks, the organs inside the baby’s body start to form one after another. However, not all organs work at the same rate; some respond a little earlier, while others take a long time to develop gradually.

“Which organ develops and is fully functional in the first trimester” — The simple answer to this question is the heart. From the very beginning, the heart starts working and keeps the baby alive. The head starts to form, the lungs take shape, the kidneys also start to develop, but none of them are in a state of full function during these three months. During this entire period, the heart is the only one that stays by the side of the baby and sustains it.

When does the heart start beating?

Within twenty-one or twenty-two days of conception, the first heartbeats begin to emerge from the baby’s chest. It’s amazing to think that the baby is smaller than a tiny egg in the mother’s womb, yet it has already begun to beat inside its chest. When the sound of that beating is heard for the first time on the ultrasound machine, the mother sitting next to her tears fill her eyes. This little sound tells her that a new life has come inside.

Why is the first heartbeat so important?

As soon as the heart beats, it starts pumping blood. Through this blood, oxygen and nutrients reach every cell of the baby’s body. If the heart did not awaken at the right time, the baby would not be able to survive. This is why the heart is called the earliest and greatest refuge in a baby’s life.

What is the condition of the heart at five weeks?

After five weeks of pregnancy, the structure of the heart becomes stronger. “which organ develops and is fully functional in the first trimester” — Researchers say that by the fifth week, the baby’s heart has mastered the task of pumping blood on its own.

The heart at five weeks is already working hard to supply the embryo with everything it needs to grow. At this time, the doctor performs an ultrasound to check whether the baby’s heart is functioning properly.

Why can’t other organs work in the first three months?

This question comes to many people’s minds. The brain begins to form, but it takes many months to become fully functional. The lungs are not fully developed until birth. The liver, although formed, begins its work later. The kidneys, although formed, become fully active in the second or third trimester. Only the heart is fully functional from the beginning.

What are the steps in the development of the heart?

“Which organ develops and is fully functional in the first trimester” — To go deeper into this topic, you first need to know how the heart develops step by step.The heart follows a beautifully organized step-by-step journey from a simple tube to a fully working organ. First, a simple tube-like structure is formed, then it begins to bend and eventually takes the shape of a full-fledged heart. From the outside, it seems like a very simple thing, but in fact, it is an amazing piece of nature’s engineering that could never be created by humans.

WeekHeart condition
Week 3First heartbeat begins
4th weekVascular structures are formed
Week 5Blood pumping in full swing
Week 6Sounds can be heard on ultrasound
Week 8Four cells are formed
Week 12Heart is fully functional

How is the first stage of heart formation?

In the third week of pregnancy, some special cells inside the embryo come together to form a tube. This tube is the future heart. At this time, it looks a lot like a small insect. But this small structure will one day save the baby’s life.

How is a full heart formed from a tubular structure?

In the fourth week, this tube begins to bend and divide into two parts. Gradually, four chambers are formed. These four chambers are the main power of the heart. Two on the right and two on the left, a total of four chambers combine to form the heart, becoming a powerful pump.

How strong is the heart at the eighth week?

After eight weeks, four separate chambers form inside the baby’s heart. “Which organ develops and is fully functional in the first trimester” — In this context, researchers repeatedly bring up the word eight weeks. Because at this time, the baby’s heart beats 150 to 170 times per minute, which is almost twice as fast as the heart of an adult. Because of this rapid rhythm, blood reaches every corner of the baby’s tiny body.

What is the condition of the heart at twelve weeks?

By twelve weeks, the baby’s heart is fully functional. At this time, the baby’s circulatory system is also fully developed. Doctors can check the heart rate by doing an ultrasound at this time to see if everything is going well.

Explore more here: what causes a subchorionic hemorrhage in early pregnancy

What happens to other organs in the first trimester?

“which organ develops and is fully functional in the first trimester” Only the heart, but the other organs do not sit completely still. The other organs start forming slowly but they take much more time to become fully operational. The head and spine do begin to develop, but they don’t really start to function until much later.The liver starts to form and does some work, but is not fully operational. The lungs only take initial formation, the ability to breathe comes after birth.

How is the brain in the first trimester?

The process of forming the brain starts from the very beginning. The neural tube is formed, which later becomes the brain and spinal cord. But the brain begins to function fully much later after conception. So the answer to this question “which organ develops and is fully functional in the first trimester” is never the brain.

Why can’t the lungs work in the first trimester?

The lungs start to form in the first trimester, but they only form airways. It takes many months for the actual respiratory cells to form, which is why premature babies often have lung problems.

What should pregnant mothers do?

The first three months are the most important for mothers, as all the organs of the baby, including the heart, begin to form. “Which organ develops and is fully functional in the first trimester” — This knowledge helps mothers to be alert. The mother’s health in the first trimester directly shapes how strong the baby’s heart and organs will be. The mother’s food, sleep, mental state, everything has a direct impact on the baby.

  • You should visit the doctor regularly
  • Eat foods rich in folic acid
  • Stop smoking and alcohol completely
  • Get enough rest
  • Stay away from mental stress
  • Drink plenty of water

Which foods help in the formation of the baby’s heart?

Vegetables, pulses, fish, milk, eggs contain a lot of nutrients that directly work in the formation of the baby’s heart. Especially fruits like spinach, bananas, pulses and oranges are very beneficial. Even if mothers in the village eat local vegetables, the baby is ensured to have adequate nutrition.

Which activities should not be done at this time?

Heavy work, staying in the sun for a long time, taking medicine on their own and taking mental stress are absolutely not right at this time. Many mothers in the village work in the fields, which can be harmful to the baby. Everyone in the family should take special care of the mother during this time.

Where to go if there is no doctor?

If there is no doctor in the village, you should go to the nearest Upazila Health Complex. Free services are provided to pregnant mothers in government hospitals. Primary care is also available in community clinics. Timely check-ups are very important for the health of the baby.

Conclusion

A baby’s life story actually begins in the first three months of pregnancy, as this period lays the most important foundation for their entire life.. What happens in the child’s body during this time is truly a wonderful engineering feat of nature. “Which organ develops and is fully functional in the first trimester” — the answer to this question is the heart, and this small organ starts working after just twenty-one to twenty-two days.

Long before coming into the world, the child proves how strong the life force is within him. This journey of the heart is not only a matter of science, it is also a matter of a mother’s deep feelings. When the sound of that little heart is heard on the ultrasound for the first time, the wave of joy that rises in every mother’s chest cannot be described in any language.

Therefore, whether in the village or in the city, every pregnant mother should take proper care of herself in the first three months. Seeing a doctor on time, eating nutritious food and having peace of mind — these three things play the biggest role in the formation of a healthy heart in the child. “Which organ develops and is fully functional in the first trimester” — this knowledge is not just the answer to a test, it is the story of the beginning of a healthy life. Remember, a healthy heart means a healthy child. And that healthy child is the greatest joy and wealth of the family.

FAQ — Frequently Asked Questions

Question 1: Which organ is fully functional in the first three months?

The heart is fully functional in the first three months. Within just three weeks of pregnancy, the heart starts beating and supplies blood, oxygen and nutrients to the baby’s body. The brain, lungs, and liver start to form, but they are not fully functional.

Question 2: At what day does the baby’s heart beat for the first time? 

The baby’s heart beats for the first time between twenty-one and twenty-two days of pregnancy. This beat can usually be heard clearly on ultrasound at five to six weeks.

Question 3: Does the brain form in the first three months? 

Yes, the brain starts to form but is not fully functional. The formation of the brain and spinal cord begins with the formation of the neural tube, but it takes many months to become fully functional.

Question 4: Which foods should mothers eat more in the first three months? 

Foods rich in folic acid such as spinach, lentils, bananas, oranges should be eaten more. Fish, milk, eggs help in the development of the baby’s heart and other organs. Drinking plenty of water is also important.

Question 5: How many times should you see a doctor in the first three months? 

You should visit the doctor at least two to three times. The first ultrasound is usually done at six to eight weeks to confirm the baby’s heartbeat.

Question 6: Do the lungs work in the first three months?

 No, the lungs do not work in the first three months. The initial formation of the lungs begins but the ability to breathe comes only after birth. Therefore, premature babies may have problems with their lungs.

Question 7: How many times does a baby’s heart beat per minute? 

In the first three months, a baby’s heart beats about 150 to 170 times per minute, which is almost twice that of an adult. This fast pace ensures adequate blood and nutrient supply to the baby’s body.

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