What you see during a miscarriage depends almost entirely on how far along the pregnancy is. Before about 6 weeks, a miscarriage can look nearly identical to a heavy period. After that, you may notice tissue, clots, and structures that are clearly different from normal menstrual bleeding. This article describes in detail what miscarriage tissue looks like at each stage of early pregnancy, how to tell it apart from regular blood clots, and what signs mean you need immediate care.
Before 6 Weeks: Very Similar to a Period
A pregnancy loss before 6 weeks is sometimes called a chemical pregnancy. At this stage, the embryo is microscopic and there is no visible sac or tissue that you’d be able to identify. What you’ll notice is a period that’s heavier or more painful than usual, possibly with small blood clots. The bleeding may start as light pink or brown spotting before turning to bright or dark red flow. Many people experience a chemical pregnancy without ever realizing they were pregnant.
At 6 Weeks
Most people can’t see anything clearly recognizable at this stage. During the bleeding, you may pass clots that contain a small sac filled with fluid. The embryo inside that sac is roughly the size of the fingernail on your little finger. If you look closely at what you’ve passed, you might also see what looks like a tiny placenta or something resembling an umbilical cord inside the sac. The clots themselves are often mixed with white or grey tissue, which is different from the dark red clots of a normal period.
At 8 Weeks
The tissue passed at 8 weeks takes on a more distinct appearance. It often looks dark red and shiny, with a texture that many people describe as resembling liver. You may find a sac containing an embryo about the size of a small bean. At this stage, if you look closely, you might be able to see the beginnings of where the eyes, arms, and legs were forming. Along with this tissue, you’ll pass blood clots and dark red material that is clearly different from menstrual bleeding in both volume and texture.
At 10 Weeks
By 10 weeks, the clots you pass are typically dark red and jelly-like in consistency. Inside one of these clots, you may find the gestational sac. Some clots contain what looks like a thin membrane, which is part of the placenta. The developing baby at this stage is usually fully formed but still very small and can be difficult to see with the naked eye, especially if it remains inside one of the larger clots.
At 12 to 16 Weeks
A miscarriage in the second trimester looks and feels quite different from an earlier loss. You may first notice a gush of clear fluid from your vagina, similar to your water breaking, followed by bleeding and clots. The fetus at this point is tiny but fully formed and may be visible outside the sac. It might still be attached to the umbilical cord and placenta. The bleeding is typically heavier than an earlier miscarriage, and the process can take longer to complete.
How Miscarriage Tissue Differs From Blood Clots
One of the most common questions during a suspected miscarriage is whether what you’re passing is just blood or actual pregnancy tissue. Normal period clots are dark red and tend to be relatively uniform. Miscarriage tissue has several distinguishing features.
Pregnancy tissue often includes white, grey, or pinkish material mixed in with the darker blood clots. The gestational sac, when visible, looks like a small fluid-filled bubble and has a different texture from a blood clot. Placental tissue can appear as a thin membrane inside a clot. Some people also notice string-like tissue, which can represent early placental or cord structures. If you’re passing material that includes these lighter-colored or textured components alongside heavy bleeding, that’s a strong indication you’re passing pregnancy tissue rather than experiencing a heavy period.
A decidual cast, which is when the uterine lining sheds in one solid piece shaped like a triangle or upside-down pear, can also be confused with miscarriage tissue. A decidual cast is a single cohesive piece of tissue that takes the shape of the uterus. It doesn’t contain a sac or embryonic structures. If you’re passing tissue and you know or suspect you’re pregnant, it’s important to get evaluated regardless of what the tissue looks like.
What the Bleeding Looks Like Over Time
Miscarriage bleeding doesn’t happen all at once. It typically begins as spotting, which can be pink, brown, or dark red. Brown blood is older blood that has taken longer to leave the uterus. Pink spotting often means the bleeding is light and mixed with cervical fluid. Once active miscarriage begins, the blood usually turns bright or dark red, and the flow becomes significantly heavier than a normal period.
The heaviest bleeding, with the largest clots and most tissue, usually lasts a few hours to a couple of days. After the main tissue has passed, bleeding typically tapers to something similar to a normal or slightly heavy period and continues for one to two weeks. The color gradually shifts from red to brown to spotting as the uterus finishes clearing.
Signs That Need Immediate Attention
Some amount of heavy bleeding is expected during a miscarriage, but certain patterns signal a problem. The clinical threshold used by hospitals is soaking through two maxi pads per hour for two consecutive hours. If you’re bleeding at that rate, or passing clots the size of a golf ball, that level of blood loss needs emergency evaluation.
Other red flags include severe abdominal pain or shoulder pain (which can indicate an ectopic pregnancy), fever or chills, dizziness or fainting, foul-smelling vaginal discharge, or pain when using the bathroom. These symptoms can point to infection, retained tissue, or a pregnancy located outside the uterus, all of which require prompt treatment.
When Tissue Doesn’t Pass on Its Own
Sometimes a pregnancy stops developing but the body doesn’t begin bleeding right away. This is called a missed miscarriage, and it’s typically discovered on ultrasound when no heartbeat is detected. You may have no symptoms at all, or you might notice that pregnancy symptoms like nausea have faded.
In other cases, some but not all of the pregnancy tissue passes, which is called an incomplete miscarriage. Signs include bleeding that stays heavy rather than tapering off, continued cramping, or still feeling pregnant a week or more after the bleeding started. If you’ve been given medication to help the tissue pass and you don’t bleed or pass tissue within 24 hours, that also suggests the process hasn’t completed. Treatment options at that point include additional medication or a brief procedure to remove the remaining tissue, after which bleeding typically resolves within one to two weeks.