Miscarriage Risk: What Every Pregnant Woman Should Know
Miscarriage is one of the most painful experiences a person can go through and it's also one of the most misunderstood. It can feel isolating, confusing, and far too often, it's accompanied by guilt and self-blame that simply isn't warranted.
Understanding the real risk factors for miscarriage, including the ones that are within your control, isn't about creating more anxiety. It's about giving you the knowledge to make informed decisions and have empowered conversations with your care team.
Watch Dr. Monique explain miscarriage risk factors and what every expecting parent should know:
How Common Is Miscarriage?
Before we talk about risk factors, it helps to have context. Between 10% and 20% of all known pregnancies end in miscarriage. The vast majority, around 80%, happen in the first trimester, before 13 weeks. After the first trimester, the risk drops significantly. By weeks 13 to 19, the risk falls to between 1% and 5%.
One of the most important things to understand is that most early miscarriages, roughly 50%,are caused by chromosomal abnormalities. This means the fertilized egg had an irregular number of chromosomes, making it impossible for the pregnancy to develop. These losses are not caused by anything the mother did or didn't do. They are beyond anyone's control.
But what about when the baby is chromosomally normal? Are there risk factors that can be identified,and in some cases, addressed? Yes. And that's exactly what Dr. Monique focuses on in this conversation.
Risk Factors When the Baby Is Genetically Normal
When a miscarriage occurs and the baby had no chromosomal abnormalities, it's worth looking at other contributing factors. Several are well-established in the research, and some are modifiable, meaning they're within your power to change.
Smoking and Alcohol
Neither of these is a surprise, but both are worth repeating clearly: smoking and drinking alcohol during pregnancy are associated with increased miscarriage risk. There is no established safe level of alcohol during pregnancy, and smoking has been linked to both pregnancy loss and complications throughout gestation. If you need support quitting, your prenatal care provider can help connect you with resources.
High Caffeine Intake
This one surprises some people. Research consistently links high caffeine consumption,more than approximately 200 milligrams per day, or greater than two cups of coffee,with an elevated risk of pregnancy loss. This doesn't mean you have to eliminate caffeine entirely, but it does mean being mindful of your total daily intake, including coffee, tea, soda, and chocolate.
Infections Acquired Early in Pregnancy
Certain infections, when contracted in early pregnancy, can increase miscarriage risk. These include sexually transmitted infections such as HIV, syphilis, and herpes. This is one reason why early prenatal care and infection screening at the start of pregnancy are so important. Many of these conditions, when identified early, can be managed in ways that protect both mother and baby.
Structural Issues With the Uterus
Some miscarriages,particularly those that occur in the second trimester, are linked to structural problems with the uterus rather than chromosomal issues with the baby.
Uterine fibroids are one such factor. Most fibroids during pregnancy don't cause problems, but fibroids that grow into the lining of the uterus (called submucosal fibroids) can interfere with implantation and the developing pregnancy. If you have a history of fibroids, discussing this with your provider before or early in pregnancy is important.
Incompetent cervix: also called cervical insufficiency, is another structural cause of second-trimester pregnancy loss. With this condition, the cervix begins to soften and open too early, often silently and without painful contractions, typically after 15 weeks of pregnancy. It can result in pregnancy loss or premature birth.
Here's the encouraging part: if an incompetent cervix is diagnosed early enough, there is a treatment option. A procedure called a cerclage,essentially a stitch placed around the cervix, can help keep it closed and significantly reduce the risk of pregnancy loss or preterm delivery. This is why regular prenatal monitoring and open communication with your provider matter so much. Early diagnosis creates options.
What Does Miscarriage Risk Look Like Week by Week?
Understanding how risk changes across pregnancy can be reassuring, especially in those early weeks when anxiety often runs highest.
At 6 weeks, the risk of miscarriage is approximately 9.4%. By 7 weeks, particularly after a heartbeat has been detected on ultrasound, it drops to around 4.2%. At 8 weeks, it falls to roughly 1.5%. After the first trimester, the risk decreases substantially for most pregnancies.
Hearing your baby's heartbeat on an ultrasound for the first time is a meaningful milestone, both emotionally and clinically. It doesn't eliminate all risk, but it's a strong sign that the pregnancy is progressing well.
Risk Factors You Should Know About
Beyond the factors Dr. Monique highlights in the video, research identifies several other contributors to miscarriage risk:
Older maternal age increases chromosomal risk. The miscarriage rate for those over 40 is notably higher than for those in their 20s. Previous miscarriages, unmanaged chronic conditions such as diabetes or thyroid disease, autoimmune disorders, hormonal imbalances, and significant stress or environmental exposures (such as pesticides or air pollution) are also associated with elevated risk.
It's also important to acknowledge what the research shows about racial disparities: miscarriage rates are higher among Black women than among white women, and the reasons are actively being studied. Health inequities, including higher rates of conditions like uterine fibroids, limited access to early and continuous care, and chronic stress related to systemic racism, all likely play a role. At Enrich Health, this reality is central to why we exist and why equitable, attentive prenatal care from providers who see and understand you matters so deeply.
What Should You Do If You Experience Bleeding?
Bleeding during pregnancy, particularly in the first trimester, doesn't automatically mean miscarriage. Light spotting is common and often not a cause for alarm. But any bleeding during pregnancy deserves a call to your provider.
Bleeding that is heavy, worsening, or accompanied by significant cramping, tissue passage, or a sudden drop in pregnancy symptoms warrants prompt evaluation. If you're unsure, call. That's what your care team is there for.
If you're in the second trimester and experience any painless pressure, unusual discharge, or a feeling that something has changed, don't wait,contact your provider right away, as these can be early signs of cervical insufficiency.
You Don't Have to Navigate This Alone
A miscarriage, whether you fear one is happening or have already experienced one, is not something you should have to face without support. The physical process is only part of it. The emotional weight can be profound and lasting, and healing takes time.
If you've experienced pregnancy loss and are thinking about trying again, pre-conception counseling is a meaningful step. It gives you and your provider the chance to review your history, identify any factors that can be addressed, and build a plan that gives your next pregnancy the best possible foundation.
And if you're currently pregnant and carrying anxiety about miscarriage risk, know that you're not alone in that feeling. Our group prenatal visits create space for these conversations, with your providers and with other expectant mothers who understand what it means to hope and worry at the same time.
Knowledge doesn't eliminate uncertainty. But it can help you move through pregnancy with greater confidence, better questions, and a team that's truly in your corner.
Frequently Asked Questions
Can stress cause a miscarriage?
There is no strong scientific evidence that everyday stress causes miscarriage. While very high levels of chronic stress may be associated with some pregnancy complications, occasional anxiety or difficult days are not known causes of pregnancy loss.
Does exercise increase miscarriage risk?
For most healthy pregnancies, moderate exercise does not increase miscarriage risk. In fact, staying active is generally encouraged. Talk to your provider about what level of activity is appropriate for your specific situation.
If I've had one miscarriage, am I more likely to have another?
One miscarriage does not significantly increase your risk. After one loss, the chance of miscarriage in a subsequent pregnancy is roughly 25%, only slightly higher than the baseline. The risk increases more meaningfully after two or more consecutive losses, at which point your provider may recommend testing to look for underlying causes.
At Enrich Health, we believe that informed conversations lead to better outcomes. If you have questions about your pregnancy, your history, or your risk factors, we're here.
Call us at (203) 200-0417 or contact our team to schedule a visit at our Hamden or Bridgeport, CT locations.
Sources & Further Reading
This article was written by the clinical team at Enrich Health and reviewed for medical accuracy. For additional reading, we recommend:
