After one miscarriage, your chance of having another is roughly the same as someone who has never had one. The baseline risk of miscarriage in any pregnancy is about 15 to 20 percent, and a single prior loss does not meaningfully raise that number. Most people who miscarry once go on to have a healthy pregnancy the next time.
If you’ve had two consecutive miscarriages, the risk of a third rises to about 25 percent. That still means you have a 75 percent chance of carrying to term. The numbers get less favorable with each additional loss, but even after three, the majority of people eventually have a successful pregnancy.
Why Most Miscarriages Are Random Events
Between 50 and 70 percent of all early pregnancy losses happen because the embryo received too much or too little genetic material during fertilization. These chromosomal errors are essentially random. They don’t reflect a problem with either parent’s health or genetics, and they’re unlikely to repeat in the same way. This is the single biggest reason that one miscarriage doesn’t predict a second: the most common cause is a one-time fluke in cell division.
A much smaller share of recurrent losses, about 2 to 3 percent, traces back to a structural chromosome issue in one of the parents called a translocation. People with a translocation are physically healthy and have no symptoms, but some of their eggs or sperm carry unbalanced genetic material. This is one of the few causes that genuinely raises the odds of repeated loss, and it can be identified through a blood test called a karyotype.
When Age Changes the Odds
Maternal age is the strongest individual predictor of miscarriage risk. At 20 to 30, the risk per pregnancy hovers around 10 to 15 percent. By 35, it climbs to roughly 20 percent. After 40, it can reach 40 percent or higher. These numbers apply to every pregnancy, not just those following a loss, but they compound: an older person who has already miscarried once is facing both the general age-related risk and the emotional weight of a prior loss.
Paternal age matters too, though it gets far less attention. Older men produce sperm with higher rates of DNA damage. Research in Fertility and Sterility found that male age was the only significant predictor of abnormal sperm DNA fragmentation in a study of infertile couples, with each additional year of age increasing the odds by about 16 percent. Elevated sperm DNA damage is linked to lower embryo quality and higher miscarriage rates. The effect becomes more pronounced around the mid-to-late 30s.
Medical Conditions That Raise the Risk
For a small but important group, recurrent miscarriage has an identifiable medical cause. The most well-studied is antiphospholipid syndrome, an immune condition where the body produces antibodies that interfere with normal blood flow to the placenta. About 15 percent of women with recurrent miscarriage test positive for these antibodies. Left untreated, their live birth rate can be as low as 10 percent. With treatment (typically low-dose aspirin combined with a blood thinner), the miscarriage rate drops by roughly 54 percent, dramatically improving the odds of a healthy pregnancy.
Other conditions that can contribute include uterine abnormalities like a septum dividing the uterine cavity, thyroid disorders, uncontrolled diabetes, and certain clotting disorders. Many of these are treatable once identified, which is why testing after repeated losses can be genuinely useful rather than just informational.
Lifestyle Factors Worth Knowing About
Caffeine is the lifestyle factor with the clearest data. A large prospective study from Kaiser Permanente found that consuming 200 mg or more of caffeine daily (roughly two standard cups of coffee) during pregnancy more than doubled the risk of miscarriage compared to no caffeine at all. Even intake below 200 mg per day showed a trend toward higher risk, though it wasn’t statistically definitive. Interestingly, this association appeared stronger in women without a prior miscarriage history than in those who had already experienced a loss.
Smoking and obesity are also associated with increased miscarriage risk, though the data on sperm quality specifically found that neither smoking nor obesity predicted DNA fragmentation as strongly as age alone did. For the pregnant person, maintaining a healthy weight and avoiding tobacco are broadly supported recommendations that apply to pregnancy outcomes well beyond miscarriage.
What Testing Looks Like After Two Losses
Most doctors won’t recommend a full workup after a single miscarriage because the cause is almost always a random chromosomal error that won’t repeat. After two consecutive losses, the picture changes. Your doctor will typically start with a detailed medical history and physical exam, then move to blood tests. These commonly check for antiphospholipid antibodies, thyroid function, blood sugar regulation, and clotting factors. Genetic testing (a karyotype) for both partners can identify translocations. Imaging of the uterus, often through ultrasound or a specialized X-ray, can reveal structural issues.
Even with thorough testing, about half of recurrent miscarriage cases have no identifiable cause. That can be frustrating, but there’s a silver lining: people with unexplained recurrent loss still have a good prognosis. Studies consistently show that with supportive care and monitoring in the next pregnancy, the majority go on to deliver a healthy baby.
Timing Your Next Pregnancy
There’s no medical consensus that waiting a specific number of months after a miscarriage reduces your risk of another one. Physically, most people can conceive again after one or two normal menstrual cycles. Some older guidance suggested waiting three months, but more recent evidence has not supported a benefit to delaying. The decision about when to try again is more about emotional readiness than biological risk. Your chances of success in the next pregnancy are not significantly affected by whether you conceive one cycle later or six.