Recurrent pregnancy loss

What counts as recurrent pregnancy loss?

Recurrent pregnancy loss usually means two or more pregnancy losses in a row, most often before 20 weeks, though the exact number used to start a full evaluation varies a little between specialists. Some providers begin testing after two consecutive losses, especially if you're over 35 or a loss happened later in the first trimester; others wait for three before recommending the full round of tests. The word "consecutive" matters — most definitions count losses that happen one after another, without a successful pregnancy in between. If you've had one loss, that alone doesn't meet the definition, even though it's still a loss worth taking seriously and grieving.

Recurrent pregnancy loss is less common than a single loss, but it isn't rare, and having it doesn't mean something is permanently wrong with your body. The large majority of people who experience one loss go on to have a successful pregnancy without ever meeting the criteria for recurrent loss. Even among people who do have two or more losses, most eventually carry a pregnancy to term, with or without an identified cause. Reaching this point can feel like a label that predicts the future — it doesn't. It's a starting point for looking more closely at what might be going on.

What causes recurrent pregnancy loss?

The most common identifiable causes are chromosomal abnormalities in the embryo, structural issues in the uterus such as a septum or fibroids, hormonal or metabolic conditions like uncontrolled thyroid disease or diabetes, and antiphospholipid syndrome, a blood-clotting disorder that can affect how the placenta develops. In a considerable share of couples who complete full testing, no clear cause is ever found — this is usually called unexplained recurrent pregnancy loss. That doesn't mean nothing is wrong; it means current testing can't identify a reason, which is a limit of the tests themselves rather than a verdict on your body.

Chromosomal abnormalities in the embryo are thought to be the single most frequent cause, and they become more common as age increases, which is one reason age and pregnancy loss are so closely linked. Less often, one parent carries a balanced chromosomal rearrangement that doesn't affect their own health but can lead to an embryo with too much or too little genetic material. Uterine causes are usually structural and can often be seen on imaging, while immune and clotting-related causes are found through blood tests. None of these causes are something you did or could have prevented by anything in your control.

What tests will a doctor run to find a cause?

A typical workup includes blood tests for antiphospholipid antibodies and thyroid function, imaging of the uterus such as an ultrasound, sonohysterogram, or hysterosalpingogram to look for structural issues, and karyotype testing for both partners to check for a balanced chromosomal rearrangement. If tissue from a loss is available, testing it for chromosomal abnormalities can sometimes explain that particular loss, even if it doesn't explain the pattern overall. Not every test is offered to every couple — your provider will usually tailor the workup to your history, age, and the details of your previous losses.

Most specialists don't recommend starting this full evaluation after a single loss, since testing is more useful, and less likely to raise anxiety over normal variation, once a pattern has been established. After two losses, especially with other risk factors, asking for testing is reasonable rather than something you need to justify. After three, most guidelines support a full evaluation as standard practice. Testing takes time, and results don't always arrive with a tidy answer — talking through what a specific test can and can't tell you, before you have it, can make the waiting easier.

Is there anything you can do to lower the risk of it happening again?

What helps depends almost entirely on whether a cause is found — treating an identified thyroid condition, managing diabetes, correcting a uterine septum surgically, or using blood thinners for antiphospholipid syndrome can each meaningfully improve the odds of a future pregnancy continuing. When no cause is found, some providers still recommend low-dose aspirin, progesterone support, or closer early monitoring in a future pregnancy, though the evidence for these varies by situation and your provider can explain what applies to you. General health steps — not smoking, moderating alcohol, and managing your weight — support fertility and pregnancy at any point, though they aren't a fix for a structural or genetic cause.

It's worth saying plainly: most pregnancy losses, including recurrent ones caused by chromosomal issues in the embryo, are not something you caused and not something you could have prevented by doing anything differently. Diet, moderate exercise, stress, and most everyday activities don't cause miscarriage, and there's no evidence that avoiding them after conception changes the outcome. If a cause is found and treated, many people go on to carry a pregnancy successfully. If no cause is found, that's frustrating, but it isn't a closed door — it just means careful monitoring is likely to be the main tool available.

What are the chances of a successful pregnancy after recurrent loss?

Most people who have had recurrent pregnancy loss, even without an identified cause, go on to have a successful pregnancy in time, though the chances decline somewhat with each additional loss and with increasing age. Two losses carry a better outlook than three or more, and outcomes are generally better under 35 than over 40, mirroring the age-related patterns seen in fertility more broadly. These are general patterns from population data, not a specific prediction for your next pregnancy — your own history, test results, and any treatment received all shift the picture in ways a general article can't capture.

If you do conceive again after recurrent loss, most providers recommend earlier and more frequent monitoring — an early ultrasound to confirm the pregnancy is developing as expected, and sometimes repeat hCG or progesterone checks in the first few weeks. A [due date calculator](/due-date-calculator) can help you and your provider track key early milestones once you have a confirmed pregnancy. The anxiety of a subsequent pregnancy after loss is real and common; naming it to your provider, rather than managing it alone, often opens the door to more frequent reassurance scans, which many people find genuinely helpful.

When should you talk to a specialist about recurrent pregnancy loss?

It's reasonable to ask for a referral to a reproductive specialist after two consecutive losses, and standard practice to pursue a full evaluation after three, though you don't need to wait for any specific number if you're over 35, have a known uterine or hormonal condition, or have been trying to conceive without success alongside the losses. Our guide to [fertility evaluation](/getting-pregnant/fertility-evaluation) covers what that first appointment usually involves, and [age and fertility](/getting-pregnant/age-and-fertility) explains how age changes the timeline for seeking help. There's no benefit to waiting once you have real questions — bring them to your provider directly.

Separately from the question of when to seek a fertility workup, call your provider the same day, or go to urgent care, if you have heavy bleeding that soaks through a pad in an hour or less for two hours in a row, severe abdominal pain, fever, or feel faint or dizzy during a suspected or confirmed loss. These symptoms need prompt medical attention regardless of how many losses you've had before. Tracking your cycle with tools like babybumpkit's [ovulation calculator](/ovulation-calculator) can help you and your provider time testing and future attempts, but it's never a substitute for calling when something feels acutely wrong.

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