What causes a miscarriage?

About half of first-trimester miscarriages are caused by chromosomal abnormalities in the embryo — the egg and sperm combined with an unusual number of chromosomes. This happens by chance and is not caused by anything you did or didn't do. The risk increases with age, affecting about 10-15% of recognized pregnancies overall and up to 33% for women over 40. Other less common causes include uterine abnormalities, hormonal imbalances, blood clotting disorders, and certain medical conditions.

When should you see a specialist after miscarriage?

ACOG recommends evaluation after two consecutive miscarriages. This may include blood tests to check hormones, thyroid function, and blood clotting factors, as well as chromosomal testing for both partners and imaging of the uterus. If you are over 35, some doctors recommend evaluation after a single loss due to the added factor of age-related fertility decline. If you have concerns after any miscarriage, it is always appropriate to ask your doctor about testing.

Can you prevent a miscarriage?

Most miscarriages cannot be prevented because they are caused by random chromosomal abnormalities. However, you can optimize your health before and during early pregnancy by taking prenatal vitamins with folic acid, maintaining a healthy weight, managing chronic conditions like diabetes or thyroid disorders, avoiding alcohol and smoking, and reducing exposure to environmental toxins. For women with identified causes of recurrent loss such as antiphospholipid syndrome, specific treatments can significantly improve outcomes.

Is it normal to feel anxious about getting pregnant again after a miscarriage?

It is completely normal and very common. Many women who become pregnant after a loss describe heightened anxiety, difficulty bonding with the new pregnancy, and fear at every medical appointment. This is sometimes called pregnancy after loss anxiety. Studies show it can persist even after the birth of a healthy child. Speaking with a therapist who specializes in pregnancy loss, joining a support group, or asking your provider about extra monitoring in early pregnancy can all help.

TTC After Miscarriage: When to Try Again and What to Know

This article contains affiliate links to books that helped us and others through pregnancy loss. If you purchase through our links, we may earn a small commission at no extra cost to you.

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First: This Was Not Your Fault

Miscarriage is common — it affects 10 to 15 of every 100 recognized pregnancies — and in most cases, it was caused by a random chromosomal error that no one could have prevented. Not the coffee. Not the stress. Not the exercise. Not anything you did or didn't do.

When Can You Try Again? The Medical Answer

The medical answer is: sooner than you might think.

According to ACOG (Practice Bulletin No. 200, reaffirmed in 2025), you can ovulate as soon as two weeks after an early first-trimester miscarriage. After one uncomplicated miscarriage, there is no medical reason to delay trying to conceive again. Many doctors suggest waiting until after your first normal period — not because it's medically necessary, but because it makes dating a new pregnancy easier.

📊 What the Research Shows: The World Health Organization previously recommended waiting six months after miscarriage before trying again. However, a large Norwegian cohort study published in PLOS Medicine (2022) analyzing over 49,000 pregnancies found that conceiving within six months of an early pregnancy loss was not associated with increased risk of preeclampsia, gestational diabetes, preterm delivery, or growth-restricted babies. Several other studies have found that conceiving within three to six months of miscarriage may actually be associated with better outcomes than waiting longer.

📋 The Current Guidance

After one uncomplicated first-trimester miscarriage: you can try as soon as you feel physically and emotionally ready, with no required waiting period. Many practitioners suggest waiting until your first normal period for dating purposes. After a second-trimester loss or a loss requiring surgical intervention (D&C), your doctor may recommend a specific waiting period based on your individual situation.

What Your Body Does After Miscarriage

Understanding the physical recovery timeline can help you feel less disoriented during an already overwhelming time.

Days 1–14: Bleeding and Physical Recovery

Bleeding typically lasts one to two weeks after an early miscarriage, though it can be shorter or longer. Cramping gradually subsides. hCG levels begin dropping — this is why a pregnancy test may remain positive for several weeks after a loss.

Weeks 2–4: hCG Clears

hCG levels typically return to zero within two to four weeks after an early miscarriage. Until hCG clears completely, pregnancy tests may show faint positives. Your doctor may monitor hCG levels with blood draws to ensure complete resolution.

Weeks 4–6: First Ovulation

Most women ovulate within four to six weeks after an early miscarriage, sometimes sooner. You can get pregnant from this first ovulation — even before your first period returns. If you're tracking with OPKs or BBT, you may see your first surge during this window.

Weeks 4–8: First Period Returns

Your first period after miscarriage typically arrives four to eight weeks after the loss. It may be heavier, lighter, or different from your usual period. Cycle length may be irregular for the first one or two cycles before normalizing.

Why Did This Happen?

The most honest answer is: most of the time, we know the general category (chromosomal abnormality) but not the specific cause. And most of the time, it was not preventable.

The Most Common Cause: Chromosomal Abnormalities

About 50–60% of first-trimester miscarriages are caused by chromosomal abnormalities in the embryo. During fertilization, the egg and sperm each contribute 23 chromosomes. If the resulting embryo ends up with too many or too few, it usually can't develop normally. This happens by chance — it's a biological error, not something caused by your behavior.

The risk of chromosomal abnormalities increases with age. For women under 30, about 10–15% of recognized pregnancies end in miscarriage. For women over 40, that number rises to about one in three. There is also some evidence that chromosomal abnormalities in sperm increase with paternal age, though the exact threshold is less clear.

Less Common Causes

Uterine abnormalities: A septate uterus (partially divided by a wall of tissue), fibroids, or Asherman syndrome (scarring) can interfere with implantation or growth.
Hormonal factors: Uncontrolled thyroid disease, unmanaged diabetes, or progesterone insufficiency.
Blood clotting disorders: Antiphospholipid syndrome (APS) is the most well-established clotting disorder associated with recurrent loss.
Immune factors: Some immune system dysfunctions may affect the body's ability to maintain a pregnancy, though research in this area is still evolving.
Parental chromosomal translocations: In a small percentage of couples, one partner carries a balanced chromosomal rearrangement that increases the chance of producing embryos with unbalanced chromosomes.

The hardest part of miscarriage isn't the medical question of "when." It's the emotional question of "am I ready?" And only you can answer that.

When to See a Specialist

ACOG recommends a comprehensive evaluation after two consecutive miscarriages (this is the definition of recurrent pregnancy loss, or RPL). Some practitioners begin evaluation after a single loss if you are over 35, given that age-related fertility decline adds urgency.

The evaluation typically includes:

Blood work: Thyroid function (TSH), blood clotting panel (antiphospholipid antibodies, factor V Leiden), hormonal assessment (progesterone, prolactin, AMH).
Genetic testing: Karyotyping of both partners to check for balanced translocations. If tissue from the miscarriage is available, it can be tested for chromosomal abnormalities.
Uterine imaging: Saline infusion sonogram (SIS), hysterosalpingogram (HSG), or MRI to evaluate uterine structure and check for fibroids, polyps, or septum.
Lifestyle and metabolic review: BMI, blood sugar, smoking status, alcohol use, and environmental exposures.

🔑 Important Context

Even after two or three miscarriages, the majority of women go on to have successful pregnancies. Fewer than 5 in 100 women have two consecutive miscarriages, and most of those women eventually carry a pregnancy to term — with or without an identified cause. Finding no specific cause after evaluation is actually the most common result, and it comes with reassuringly good odds for the next pregnancy.

The Emotional Side — What Nobody Tells You

The medical articles tell you when your body is ready. They rarely prepare you for how pregnancy after loss actually feels.

Pregnancy after miscarriage is often described as a paradox: you desperately want it, and you're terrified of it at the same time. Every twinge, every spotting episode, every day without symptoms can send your anxiety spiraling. This is normal. This is expected. And it doesn't mean anything is wrong.

What to expect emotionally

Anxiety that doesn't match logic. You may know intellectually that the odds are in your favor, but your body and emotions haven't caught up. This is a trauma response, not irrationality.
Difficulty bonding with the new pregnancy. Some women protect themselves emotionally by holding back excitement. You might avoid buying anything, avoid announcing, avoid even thinking of yourself as pregnant. This is self-protection — and it's okay.
Grief and joy coexisting. Getting pregnant again doesn't erase the loss. You may feel guilty for being happy about a new pregnancy, or guilty for still grieving. Both feelings are valid, and they can live side by side.
Milestone anxiety. Certain weeks — especially the week you lost the previous pregnancy — can trigger intense fear. Many women describe holding their breath until they pass the gestational age of their loss.

What can help

Ask for extra monitoring. Many OBs and midwives will offer early ultrasounds and more frequent check-ins for patients with a history of loss. Even if the scan doesn't change the outcome, seeing a heartbeat can provide temporary relief.
Talk to someone who gets it. Grief after miscarriage is unique — people who haven't experienced it often don't know what to say. Support groups (online and in person) connect you with people who truly understand. Organizations like Share Pregnancy & Infant Loss Support, The Compassionate Friends, and Pregnancy After Loss Support offer communities specifically for this experience.
Consider therapy. A therapist who specializes in pregnancy loss or perinatal mental health can provide tools for managing anxiety that general well-meaning advice cannot.
Take it one day at a time. You don't have to feel happy about the whole pregnancy at once. Today, you are pregnant. That is enough for today.

Optimizing Your Next Cycle

While most miscarriages can't be prevented, there are evidence-based steps you can take to give your next pregnancy the best possible foundation:

Start a prenatal vitamin with at least 400 mcg of folic acid before you start trying. Ideally, begin three months before conception to build folate stores. See our prenatal vitamin picks.
Manage chronic conditions. Get thyroid levels, blood sugar, and blood pressure into target range before conceiving.
Limit alcohol and stop smoking. Both are associated with increased miscarriage risk.
Consider CoQ10 supplementation. Emerging evidence suggests CoQ10 may support egg quality, particularly for women over 35. See CoQ10 options.
Track your cycle. Understanding your ovulation timing helps you time intercourse and gives your doctor useful data. A BBT thermometer and free app like Fertility Friend can help.

Books That Help

Reading about pregnancy loss from people who have been through it can feel less isolating than clinical articles. These books come recommended by the TTC-after-loss community:

It Starts with the Egg by Rebecca Fett — the science of egg quality and what you can do to improve outcomes.
Not Broken: An Approachable Guide to Miscarriage and Recurrent Pregnancy Loss by Dr. Lora Shahine — compassionate and evidence-based, written by a reproductive endocrinologist who has experienced loss herself.
Taking Charge of Your Fertility by Toni Weschler — the definitive guide to understanding your cycle, especially useful after a loss when your cycles may be irregular.

Frequently Asked Questions

You can ovulate as soon as two weeks after an early miscarriage. ACOG states that after one uncomplicated first-trimester miscarriage, there is no medical need to wait. Many doctors suggest waiting until after your first normal period for easier dating. A Norwegian study found no increased risk of complications when women conceived within six months of an early loss.

About half of first-trimester miscarriages are caused by chromosomal abnormalities — the embryo received an unusual number of chromosomes. This happens by chance and is not caused by anything you did. The risk increases with age. Other less common causes include uterine abnormalities, hormonal imbalances, blood clotting disorders like antiphospholipid syndrome, and certain medical conditions.

No. After one miscarriage, your chances of a successful next pregnancy are roughly the same as someone who has never had a miscarriage. Recurrent loss (two or more consecutive miscarriages) affects fewer than 5 in 100 women. Even after multiple losses, the majority of women go on to have successful pregnancies.

ACOG recommends evaluation after two consecutive miscarriages. If you are over 35, some doctors recommend evaluation after a single loss. Testing may include blood work for thyroid and clotting disorders, chromosomal testing for both partners, and uterine imaging.

Most miscarriages cannot be prevented because they're caused by random chromosomal abnormalities. You can optimize your health with prenatal vitamins, maintaining a healthy weight, managing chronic conditions, and avoiding alcohol and smoking. For women with identified causes of recurrent loss such as antiphospholipid syndrome, specific treatments can significantly improve outcomes.

Completely normal and very common. Many women describe heightened anxiety, difficulty bonding with a new pregnancy, and fear at every appointment. Speaking with a therapist who specializes in pregnancy loss, joining a support group, or asking for extra early monitoring can help. Your feelings are valid no matter what they are.

Medical Disclaimer: This article is for informational purposes only and is not a substitute for professional medical advice. Every pregnancy loss is unique, and your physical and emotional recovery timeline may differ from what is described here. If you have experienced a miscarriage, please consult with your OB-GYN or reproductive endocrinologist for guidance specific to your situation. If you are struggling emotionally, reaching out to a therapist, counselor, or support organization can provide meaningful help.