Miscarriage Statistics Week-by-Week: Risks & Signs


Miscarriage is always a concern for women who are pregnant or are trying to get pregnant. According to recent miscarriage statistics, up to 30% of all pregnancies end in miscarriage, and up to 75% of conceptions fail to implant. That’s a startling – and frightening – statistic. To make matters worse, many women miscarry before they even realize they’re pregnant. The good news is that the risk of losing the baby decreases as the pregnancy progresses.

Let’s analyze miscarriage risk by week, so you know what to expect.

Risk of Miscarriage By Week

1. Miscarriage at 4 weeks: 22-75%

Pregnant woman with stomach pain holding hands on her belly, concept of health care, nausea, aches in pregnancy and risk of miscarriage.The risk of miscarriage is the highest in the early stages of pregnancy. Between 22% and 75% of all healthy women will miscarry between three and four weeks.

The risk of miscarriage at 3 weeks and 4 weeks is so great because implantation may fail. The sperm may fertilize the egg, but if the egg fails to implant itself into the uterus, the pregnancy will end in miscarriage.

While this statistic is concerning, it’s nothing to be concerned about if you’ve already confirmed your pregnancy. At this stage, the egg is already implanted, and the pregnancy is much more likely to go to full-term.

Signs of miscarriage at 3-4 weeks:

  • Lower back pain
  • Moderate to severe cramping
  • Spotting that leads to moderate/heavy bleeding
  • Passage of clots
  • Bleeding for an extended period of time (up to 10 days)

[Read more about Cramping]

It’s important to note that if you’re experiencing these symptoms, it does not necessarily mean that you had a miscarriage. Some women experience a threatened miscarriage (i.e. the above symptoms) and continue on with their pregnancy. For this reason, it’s important to see a doctor to ensure that you have, indeed, miscarried. If not, progesterone treatments may be administered to reduce the risk of miscarriage later on.miscarriage risk at 3,4,5,6,7,8,9,10,11,12 weeks

2. Miscarriage at 5 weeks: 10%

As you can see, the risk of miscarrying is reduced greatly after the first 3-4 weeks. By week 5, the chances of losing a pregnancy drops to just 10%.

At five weeks, you’re one week past your missed period. At this point, the embryo is just the size of a sesame seed, and made up of three layers: the endoderm, ectoderm and mesoderm. Shortly, these three layers will form all of the baby’s organs. You’re probably experiencing some of the symptoms that go along with early pregnancy, including fatigue, nausea, frequent urination and sore breasts.

The risk of miscarriage is lower than during the first four weeks of pregnancy, so you can breathe a sigh of relief.

To help prevent a miscarriage, make sure that you’re taking good care of yourself and following your doctor’s recommendations. You should also be taking a prenatal vitamin to support a healthy pregnancy.

If you experience any uncomfortable or concerning symptoms, consult with your doctor as soon as possible. Although the risks of miscarriage are lower, your pregnancy is still in a fragile state.

Signs of miscarriage at 5 weeks

  • Moderate to heavy bleeding
  • Heavy cramping
  • Passing of blood clots
  • Heaviness in the abdominal area
  • Cessation of pregnancy symptoms

Even after you’ve miscarried, a home pregnancy test may still register as positive. This is because the hCG levels in your body may still be high. Levels will decrease over the next few days or weeks as the body heals and recovers from the event.

3. Miscarriage at 6-7 weeks: 5%

By week 6-7, your baby is starting to develop rapidly. If your pregnancy has progressed this far, the risk of having a miscarriage drops even lower to 5%.

The signs and symptoms of miscarriage at 7 weeks are very similar to the signs of miscarriage at 6 weeks.

Signs of Miscarriage at 6-7 weeks

  • Moderate to heavy bleeding
  • Lower back pain and cramping that may be very severeYoung pregnant woman suffering from backache at home.
  • Passage of clots
  • Extended bleeding for 7-10 days
  • Heaviness in the abdominal area
  • Cessation of pregnancy symptoms

If you suspect that you might have miscarried at the 6-7 week mark, it’s important to see your doctor as soon as possible to confirm the miscarriage and ensure that the uterus expelled all of the fetal tissue.

4. Miscarriage at 8 weeks: 3%

At week 8, you may be able to hear your baby’s heartbeat, which significantly reduces the risk of miscarriage. According to the Miscarriage Association of the UK, the presence of a heartbeat increases the chances of continuing the pregnancy by nearly 98%. The risk continues dropping with each passing week.

At this point, it’s still important to ensure that you’re doing everything you can to support a healthy pregnancy. Follow your doctor’s recommendations on diet, activity level and medications. While the risk of miscarrying is very low, it’s still important to remain vigilant and provide your baby with a healthy, nurturing environment.

Signs of miscarriage at 8 weeks:

  • Severe cramping and pain in the lower back
  • Heavy bleeding
  • Passing of clots or what appears to be the embryonic sac
  • Fatigue
  • Cessation of pregnancy symptoms

If you experience any of the above symptoms, see your doctor right away. You may be experiencing a miscarriage or another serious medical condition.

5. Miscarriage at 9 Weeks: 3%

By 9 weeks, your baby is about one inch long, or the size of a grape. All of the baby’s essential body parts have formed, the heart has finished dividing into four chambers, and valves are starting to form. You may be feeling the full force of morning sickness and your emotions may be running high at this point.

As you inch closer to the 14th week mark (the start of the second trimester), your risk of miscarriage continues to drop.

Signs of Miscarriage at 9 Weeks:

  • Cramping and pain in the lower back that may be severe
  • Heavy bleeding
  • Passing of clots or what appears to be the embryonic sacBlood clot and thrombosis medical 3d illustration.
  • Fatigue
  • Cessation of pregnancy symptoms

6. Miscarriage at 10 Weeks: 2-3%

The chances of miscarriage are very low at the 10 week mark, but that does not mean complications cannot arise. Only 2-3% of pregnancies end in miscarriage at the 10 week mark, so the odds of continuing your pregnancy are in your favor.

Signs of Miscarriage at 10 Weeks:

  • Cramping and lower back pain
  • Heavy bleeding that may start as spotting
  • Passing of clots or what appears to be the embryonic sac
  • Fatigue
  • Cessation of pregnancy symptoms

It becomes even more important and urgent that you visit your doctor if you experience the above symptoms during week 10 of your pregnancy. Symptoms may become even more uncomfortable or severe at this point. Check with your doctor to confirm the miscarriage and ensure that all of the tissue has passed.

7. Miscarriage at 11-12 Weeks: 2-3%

The chances of miscarrying at 11-12 weeks are reduced even further. At this point, you should be more concerned about supporting your pregnancy and dealing with those uncomfortable pregnancy symptoms you’re experiencing.

Why Do Miscarriages Happen?

If you take a look at miscarriage rates by week, you’ll notice one trend: the risk of miscarriage reduces greatly with each passing week. That’s good news for women who are worried about losing a pregnancy. While miscarriages can and do happen, the odds are in your favor that your pregnancy will continue on to full-term and birth.

That being said, you may be curious why miscarriages happen – especially if you have had one in the past. First, it’s important to remember that just because you experienced a miscarriage in the past, that does not mean you will not go on to have a healthy pregnancy in the future. For most women, a miscarriage happens once and is never experienced again.

There are a few reasons why miscarriages happen.

Chromosome Abnormalities

Genetic abnormality of chromosome 22, a factor in chronic myeloid leukemia.Chromosome abnormalities account for the majority of miscarriages (at least 60%). Chromosomes are the microscopic structures inside of our cells that carry our genes. We each have 23 pairs of chromosomes, and we get one set from each of our parents. Sometimes, when the egg and sperm meet, one of them is faulty. When this happens, the chromosomes may not be able to line up properly.

When chromosomal abnormalities occur, the pregnancy ends in miscarriage. If multiple miscarriages occur, couples may learn that they have chromosomal abnormalities that prevent pregnancy, but do not affect them.

Other common causes of miscarriage include:

  • Abnormalities in the uterus or cervix
  • Untreated illnesses, included diabetes and thyroid conditions
  • Immunologic disorders
  • Bacterial infection
  • Lifestyle factors, including excessive caffeine intake, alcohol abuse and smoking

Common Symptoms of Miscarriage

The most common symptom of a miscarriage is bleeding. Miscarriage blood is not like the typical spotting that most women experience during early pregnancy. Bleeding may be heavy at times, you may pass clots, and you may experience severe cramping.

Can a Miscarriage Be Prevented?

In most cases miscarriages cannot be prevented. If chromosomal abnormalities are the cause of the miscarriage, there would have been nothing that either of you could have done to prevent the loss. It simply was not meant to be.

If lifestyle choices or untreated illness was the cause of the pregnancy loss, making appropriate changes can improve your chances of carrying your next baby to full-term.

The reduced chances of miscarriage by week should bring you comfort in knowing that if you’re far enough along to hear the baby’s heartbeat, there’s an excellent chance that your pregnancy will continue.

Read More: 

Miscarriage Risk by Week- Plus Signs, Symptoms And Causes

What Does Miscarriage Look Like?


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