Miscarriage blood clots typically look dark red and shiny, often described as resembling raw liver or dark jelly. What you pass will vary depending on how far along the pregnancy was, ranging from heavy period-like clots in the earliest weeks to larger, more distinct tissue in later weeks. Knowing what to expect can help you understand what’s happening in your body and recognize when something needs medical attention.
What Clots and Tissue Look Like by Week
In the very earliest weeks of pregnancy (around 5 to 6 weeks), a miscarriage can look almost identical to a heavy period. You may pass small blood clots and notice heavier-than-normal bleeding, but there’s often no visible tissue that looks distinctly different from menstrual blood.
By around 8 weeks, the tissue you pass tends to look dark red and shiny. Many women describe it as looking like liver. At this stage, you may also notice a small, fluid-filled sac that’s lighter in color, sometimes grayish or translucent. This is the gestational sac, and it can be as small as a grape. It’s easy to miss among the blood and clots, and not everyone notices it.
At 10 weeks, clots are typically dark red with a jelly-like consistency. They feel softer and more slippery than typical menstrual clots. You’re more likely to see distinct pieces of tissue alongside regular blood flow at this point.
Between 16 and 20 weeks, the tissue passed is larger and more recognizable. You might see large, shiny red clots that look like liver, along with other pieces that look and feel like membrane, thin and somewhat translucent. At this stage, the process is closer to labor than a heavy period, and the tissue is more substantial.
Blood Clots Versus Pregnancy Tissue
During a miscarriage, you pass two different things: blood clots and pregnancy tissue. Regular blood clots are dark red to maroon, smooth or slightly lumpy, and similar to what you might see during a heavy period, just larger. Pregnancy tissue looks different. It can appear grayish, pinkish, or whitish and often has a different texture, sometimes described as stringy, spongy, or membrane-like.
The gestational sac, if you see it, is a small round or oval structure that may look translucent or slightly opaque. Some women describe it as looking like a tiny water balloon. Placental tissue tends to be darker and more solid. Not everyone can tell these apart in the moment, and that’s completely normal. If your doctor has asked you to watch for tissue passage, you can collect what you pass in a clean container for them to examine.
How Long the Heaviest Bleeding Lasts
Most women pass the bulk of the tissue within a few hours once cramping and active bleeding begin. The entire process, from first spotting to the end of bleeding, often takes up to two weeks after a miscarriage is diagnosed, though it can stretch longer. After the heaviest phase, lighter bleeding and spotting commonly continue for another one to two weeks.
The cramping tends to peak during the hours when the most tissue is passing. Many women describe it as similar to strong period cramps or, in later miscarriages, early labor contractions. Once the tissue has passed, the cramping usually eases significantly.
When Bleeding Is Too Heavy
Some bleeding and clotting is expected, but there’s a clear line where it becomes a medical emergency. If you’re soaking through two full-sized pads per hour for two or more hours, or passing clots the size of a golf ball, go to your nearest emergency department. Other warning signs include feeling dizzy or faint, developing a fever, or noticing foul-smelling discharge, which can signal an infection.
Signs of Incomplete Miscarriage
Sometimes the body doesn’t pass all the pregnancy tissue on its own. This is called an incomplete miscarriage, and it’s important to recognize because retained tissue can lead to infection or prolonged bleeding. Signs include bleeding that stays heavy or doesn’t taper off after the first week or two, persistent cramping, continued feelings of pregnancy (nausea, breast tenderness), or fever and chills.
If you were given medication to help the tissue pass and you don’t bleed or pass anything within 24 hours of taking it, that’s worth reporting to your care provider. Similarly, if you had a surgical procedure and still feel pregnant a week afterward, follow up.
What Else Could It Be
Not every large clot or piece of tissue means a miscarriage. A decidual cast is one condition that can look alarming but is something different entirely. It happens when the lining of your uterus sheds in one large piece rather than breaking apart gradually like a normal period. A decidual cast is usually red or pink, looks fleshy like raw meat, and takes on the shape of your uterine cavity, resembling an upside-down triangle or pear. Most are about the size of a walnut or small lime. They can be startling to see but are not a pregnancy loss. They’re more commonly associated with hormonal contraceptives.
Very heavy periods can also produce large clots that look similar to early miscarriage tissue. If you’re unsure whether what you’ve passed is related to a pregnancy, a blood test measuring pregnancy hormone levels can clarify the situation quickly.