A missed miscarriage is a pregnancy loss where the embryo or fetus has stopped developing, but the body hasn’t recognized the loss or begun to pass the tissue. Unlike other types of miscarriage, there is often no bleeding or cramping to signal that something has gone wrong. Most missed miscarriages are discovered during a routine ultrasound, sometimes weeks after the pregnancy actually stopped progressing.
This type of loss occurs within the first 12 weeks of pregnancy. It can involve an embryo that had a heartbeat that later stopped, or a gestational sac that grew but never developed an embryo at all (sometimes called a blighted ovum).
How a Missed Miscarriage Is Diagnosed
Because the body continues to act pregnant for a time, a missed miscarriage is almost always found on ultrasound rather than by symptoms alone. Doctors use specific measurements to confirm the diagnosis and avoid any chance of error. A pregnancy is confirmed as nonviable when one of two criteria is met: the embryo measures at least 7 mm in length (crown to rump) with no detectable heartbeat, or the gestational sac measures at least 25 mm in diameter without any visible embryo inside.
Earlier guidelines used smaller cutoffs, but ACOG updated its recommendations to ensure a 0% false-positive rate. If measurements fall below these thresholds, a follow-up ultrasound is typically scheduled one to two weeks later to check for growth before any diagnosis is made. This waiting period can be agonizing, but it exists to protect against misdiagnosis in very early pregnancies where dates may be uncertain.
Why It Happens
Chromosomal abnormalities are the leading cause, responsible for roughly 50 to 60% of first-trimester losses. These are random errors in the number or structure of chromosomes that happen during fertilization or the earliest cell divisions. The most common type is a whole extra or missing chromosome (like an extra copy of chromosome 16), which accounts for about 73% of the chromosomal problems found in first-trimester losses. Triploidy, where the embryo has an entire extra set of chromosomes, makes up another 10%.
These errors are not caused by anything the parent did or didn’t do. They’re essentially a biological quality check: an embryo with the wrong number of chromosomes usually cannot develop normally, and the pregnancy ends early. Other, less common causes include uterine structural abnormalities, autoimmune conditions, thyroid disorders, and hormonal imbalances. In many cases, no specific cause is ever identified.
Symptoms That May (or May Not) Appear
The defining feature of a missed miscarriage is the absence of obvious signs. Many women continue to feel pregnant because pregnancy hormones decline gradually rather than dropping immediately. A pregnancy test can remain positive for days or even weeks after the embryo stops developing.
Some women do notice subtle shifts. Pregnancy nausea that suddenly disappears, or breast tenderness that fades, can sometimes precede a diagnosis. Research has consistently found that nausea and vomiting are associated with lower miscarriage risk: women who experience vomiting have a loss rate of only 1 to 5%, compared with 4 to 10% among those with nausea alone. However, this doesn’t mean the absence of nausea reliably predicts a loss. Morning sickness typically peaks late in the first trimester, by which point most missed miscarriages have already occurred. A pregnancy that ends at six or seven weeks simply had less time to produce nausea in the first place.
Light spotting or brown discharge can also appear, but many women with missed miscarriages report no bleeding whatsoever until the loss is discovered.
Three Options for What Comes Next
Once a missed miscarriage is confirmed, there are three ways to manage it. The choice is almost always yours, and no single option is medically superior for everyone.
Expectant Management (Waiting)
This means allowing the body to recognize the loss and pass the tissue on its own, without intervention. It can take days to several weeks. For some women, this feels like the most natural path, but it involves unpredictable timing. The process typically involves cramping and bleeding similar to a heavy period, though for a missed miscarriage specifically, the wait before anything begins can be long enough that many women eventually choose one of the other options.
Medication
Medication can speed the process along. For a missed miscarriage (as opposed to an incomplete one), a hormonal preparation is given first, followed 24 to 48 hours later by a second medication that causes the uterus to contract and pass the pregnancy tissue. This usually works within several hours, though some women experience heavy bleeding and significant cramping. In a large randomized trial, about 38% of women with an early fetal loss who were assigned to medication management ended up needing a surgical procedure anyway because the medication didn’t fully work. That’s a meaningful number to weigh when choosing this route.
Surgical Procedure
A suction procedure (commonly called a D&C) is performed under anesthesia and takes about 10 to 15 minutes. It’s the most definitive option, with only about 6% of women needing an additional unplanned procedure afterward. Many women choose surgery to avoid the uncertainty of waiting or the physical intensity of medication. It also allows the tissue to be sent for genetic testing, which can provide answers about why the loss happened.
Physical Recovery
Regardless of which management option you choose, some bleeding or spotting is normal afterward. Most women get their first period about two weeks after all spotting ends, which works out to roughly two to three months after the loss. This first cycle may be heavier or lighter than usual, and it can take a few cycles for things to feel regular again.
Physically, the body recovers relatively quickly. The hormonal shift back to a pre-pregnancy state takes a few weeks, during which some women experience mood changes, fatigue, or breast tenderness as hormone levels drop.
Trying to Conceive Again
Older guidelines recommended waiting three to six months before trying to get pregnant again. The World Health Organization suggested at least six months. Current evidence does not support either recommendation. A study from the National Institutes of Health found that women who began trying within three months of an early loss conceived just as quickly, if not faster, than those who waited longer, with no increased risk of pregnancy complications.
The researchers found no physiological reason to delay conception once bleeding has resolved and the menstrual cycle has returned. The uterus may actually be more receptive to a new pregnancy in the months immediately following a loss. The more relevant factor for most couples is emotional readiness, which varies enormously from person to person and has no universal timeline.