A late miscarriage is the loss of a pregnancy between 14 and 20 weeks of gestation. It falls after the more common first-trimester losses (before 13 weeks) and before the 20-week threshold where the medical term shifts to stillbirth. About 2 to 3% of pregnancies end in a second-trimester loss, making it far less common than early miscarriage but deeply significant for the families who experience it.
How Late Miscarriage Differs From Early Loss
Most miscarriages happen in the first trimester, often before a person even knows they’re pregnant. By the time a pregnancy reaches the second trimester, the risk of loss drops considerably, and by 20 weeks, fewer than 0.5% of pregnancies end in fetal death. That steep decline in risk is part of what makes a late miscarriage so unexpected and difficult. Many people have already shared the news, begun planning, and felt the pregnancy become physically real.
The causes also shift. First-trimester losses are most often driven by chromosomal abnormalities in the embryo. Late miscarriages, while sometimes chromosomal, are more frequently tied to problems with the cervix, the placenta, or the uterine environment. This distinction matters because some of those causes are identifiable and, in future pregnancies, potentially treatable.
Common Causes
Cervical Insufficiency
One of the most recognized causes of late miscarriage is cervical insufficiency, where the cervix begins to open painlessly during the second trimester without contractions. Normally, the cervix stays tightly closed until labor begins. With cervical insufficiency, a structural or functional weakness causes it to shorten and dilate too early, which can lead to the membranes rupturing or the pregnancy being delivered before viability. This often happens silently, and many people don’t know they have the condition until after a loss. It’s frequently diagnosed in hindsight, though it can sometimes be detected on ultrasound during an ongoing pregnancy if the cervix is being monitored.
Placental Problems
The placenta plays a central role in many second-trimester losses. Research examining placental tissue after late miscarriages has found that placental abruption, where the placenta separates from the uterine wall, is the most common abnormality. The second most frequent finding involves poor blood flow through the maternal blood vessels that supply the placenta, a pattern that also shows up in conditions like preeclampsia and fetal growth restriction.
In some cases, the placenta doesn’t embed deeply enough into the uterine wall during the early weeks of pregnancy, leaving it unable to support the growing fetus later on. Certain inherited clotting disorders, such as Factor V Leiden and the prothrombin gene mutation, roughly triple the risk of late miscarriage, likely because they promote blood clots in the small vessels of the placenta.
Infection and Other Factors
Infections that reach the uterus, particularly inflammation of the membranes surrounding the fetus (chorioamnionitis), can trigger preterm labor or membrane rupture in the second trimester. Uterine abnormalities, such as a septum dividing the uterine cavity or large fibroids, can also contribute by limiting the space available for the pregnancy to grow or by disrupting blood supply. In some cases, no clear cause is found even after thorough testing.
Symptoms to Recognize
Late miscarriage can present differently depending on the cause. The most common signs include vaginal bleeding that may range from light spotting to heavy flow, cramping or pressure in the lower abdomen or back, and a gush of fluid if the membranes rupture. Some people notice that fetal movement has stopped or changed, particularly in the later weeks of the second trimester when kicks have become noticeable.
With cervical insufficiency, the process can be especially deceptive. Because the cervix dilates without painful contractions, some people feel only mild pelvic pressure or a sense of fullness before the loss is already underway. Any unusual vaginal discharge, persistent pressure, or bleeding in the second trimester warrants prompt evaluation.
How a Late Miscarriage Is Confirmed
Ultrasound is the primary tool used to confirm a pregnancy loss. In the second trimester, the scan will check for a fetal heartbeat. If no heartbeat is detected, the diagnosis is typically straightforward at this stage. In earlier or ambiguous cases, guidelines recommend waiting at least seven to ten days for a follow-up scan before confirming non-viability, to ensure the diagnosis is certain. Transvaginal ultrasound provides the clearest images and is preferred over abdominal scanning for accuracy.
What Happens During and After
Once a late miscarriage is confirmed, the pregnancy needs to be delivered. There are two main approaches. The first is medical management, where medication is used to induce labor so the body delivers the pregnancy vaginally. This can take several hours and typically happens in a hospital. The second is a surgical procedure called dilation and evacuation, performed under sedation or anesthesia. Research comparing the two methods in second-trimester losses found that the surgical approach had a significantly lower complication rate (4% versus 29%), though the medical approach using newer medications like misoprostol narrowed that gap considerably compared to older drug regimens.
The choice between these options depends on how far along the pregnancy was, the specific clinical circumstances, and personal preference. Some people feel strongly about one approach over the other, and both are considered standard care.
Physical Recovery
Bleeding after a late miscarriage typically lasts for a few weeks, gradually tapering. Periods generally return within four to eight weeks, though it can take several months for cycles to become regular again. Because the pregnancy was further along, some people experience breast engorgement and milk production, which resolves on its own but can be physically uncomfortable and emotionally painful.
Physical healing from the procedure itself, whether medical or surgical, usually takes two to six weeks. Most providers recommend avoiding sex until bleeding and symptoms have fully resolved, both for comfort and to reduce infection risk.
Emotional Impact
A late miscarriage carries a particular emotional weight. By the second trimester, many people have seen detailed ultrasound images, heard the heartbeat repeatedly, and begun to bond with a baby they expected to hold. The grief can be intense and is often compounded by the physical experience of labor or surgery, hormonal shifts, and the reality that the loss is less common and therefore less understood by others.
Partners, siblings, and extended family are affected too. There is no normal timeline for emotional recovery, and the process looks different for everyone. Support groups, counseling, and simply having the loss acknowledged can make a real difference.
Future Pregnancies After Late Loss
One of the first questions people ask after a late miscarriage is whether it will happen again. The answer depends heavily on the cause. If cervical insufficiency was identified, a cervical stitch placed early in the next pregnancy can significantly reduce the risk of recurrence. If a clotting disorder is found, blood-thinning medication during pregnancy may help protect the placenta.
The broader picture, however, is sobering. A study published in the American Journal of Obstetrics and Gynecology found that women who experienced a second-trimester loss had a high rate of complications in subsequent pregnancies, around 65 to 72%, including preterm birth, growth restriction, and preeclampsia. These aren’t all repeat miscarriages, but they reflect the overlap between the underlying causes of late loss and other placental complications. Close monitoring in future pregnancies, often including cervical length checks, additional ultrasounds, and sometimes medication, is standard for anyone with a history of second-trimester loss.