The most common signs of a miscarriage are vaginal bleeding and cramping that feel more intense than a normal period, but some miscarriages happen with no obvious symptoms at all. Because bleeding in early pregnancy is common and doesn’t always mean a loss, the only way to know for certain is through an ultrasound or blood tests ordered by your doctor. Here’s what to look for and what the process of finding out typically involves.
Bleeding Patterns That May Signal a Miscarriage
Vaginal bleeding is the most recognizable sign, but it varies enormously from person to person. The blood may be light spotting or heavy flow, bright red or dark brown. You might pass clots or stringy tissue. Some people notice more of a watery discharge than obvious bleeding. The bleeding can be continuous or come and go over days or even weeks, which makes it hard to judge on its own.
What often distinguishes miscarriage bleeding from the lighter spotting that’s normal in early pregnancy is the combination of bleeding with strong, rhythmic cramping in the lower abdomen or back. These cramps tend to come in waves and feel more like contractions than the dull ache of a typical period. That said, some people experience only spotting with mild or no cramping, particularly very early in pregnancy.
The amount of tissue you see depends on how far along the pregnancy was. Before about six weeks, it can look almost indistinguishable from a heavy period with clots. Around six weeks, you might notice small clots containing a tiny fluid-filled sac. The embryo at that stage is roughly the size of a pinky fingernail. Later in the first trimester, the tissue becomes more recognizable, and you may see membranes or small formed structures.
When There Are No Symptoms at All
A “missed miscarriage” is a loss where the pregnancy has stopped developing but your body hasn’t begun the process of passing the tissue. This type is often discovered at a routine ultrasound scan, typically around 12 weeks. The scan shows a pregnancy sac with an embryo inside, but no heartbeat, and the pregnancy measures smaller than expected for the gestational age.
The reason you may feel completely fine is that pregnancy hormones can remain high for days or even weeks after the embryo stops developing. You may still have nausea, breast tenderness, and fatigue. A home pregnancy test will still show positive. There is no reliable way to detect a missed miscarriage on your own without an ultrasound, which is part of what makes it so unsettling. The delay between when the pregnancy stops and when the body responds varies widely, from a few days to several weeks.
Other Causes of Bleeding in Pregnancy
Not all bleeding means a miscarriage. One relatively common cause is a subchorionic hematoma, which is a pocket of blood that collects between the uterine wall and the membrane surrounding the pregnancy. It can cause bleeding that ranges from light spotting to heavy flow with clots, sometimes with mild pelvic cramping. Many people with a subchorionic hematoma have no bleeding at all and only learn about it during a routine ultrasound, where it appears as a crescent-shaped collection of fluid.
A subchorionic hematoma does carry a somewhat higher risk of complications, including miscarriage, but many pregnancies continue normally. Implantation bleeding, cervical irritation, and infections can also cause spotting in early pregnancy. The key point is that bleeding alone doesn’t confirm a loss. It does, however, warrant a call to your doctor or midwife so they can evaluate what’s happening.
How Doctors Confirm a Miscarriage
Two main tools are used: ultrasound and blood tests measuring pregnancy hormone levels (hCG).
On ultrasound, doctors look at specific measurements to determine whether a pregnancy is viable. If the embryo measures a certain size and no heartbeat is detected, or if the pregnancy sac reaches a certain diameter without an embryo visible inside, the pregnancy is considered nonviable. Doctors use conservative thresholds to avoid any chance of a wrong diagnosis, so you may be asked to return for a follow-up scan a week or two later if the results are uncertain. This waiting period can feel agonizing, but it exists to make sure the diagnosis is correct.
Blood tests track whether your hCG levels are rising appropriately. In a healthy early pregnancy, hCG roughly doubles every 48 to 72 hours. If levels are falling or failing to rise at the expected rate, your doctor will be concerned the pregnancy may not be viable. A single blood draw isn’t usually enough. You’ll typically have at least two draws spaced two to three days apart so the trend can be evaluated.
In many cases, doctors use both tools together. An ultrasound may show a pregnancy that’s too early to see a heartbeat, so blood tests help clarify whether things are progressing or not.
What the Physical Process Feels Like
If a miscarriage progresses on its own, most of the tissue passes within two to four hours once heavy cramping and bleeding begin. The cramping tends to be intense during that window, then drops off significantly. For most people, cramping stops within about a day. Light bleeding or spotting, however, commonly continues for four to six weeks afterward.
Pregnancy symptoms like nausea and breast tenderness typically fade within a few days of passing the tissue, though this varies. Most people feel physically ready to return to normal activities within a day or two, whether the miscarriage happened naturally or involved a procedure to remove the tissue. The emotional recovery is a different timeline entirely, and there’s no standard for how long that takes.
Signs That Need Immediate Attention
Most miscarriages, while painful and distressing, resolve without serious medical complications. But certain symptoms indicate something more dangerous is happening.
- Heavy hemorrhage: If you’re soaking through more than one medium-sized pad per hour, or if heavy bleeding is accompanied by dizziness, a racing heartbeat, or unusual weakness, you need emergency care. Some people with hemorrhage require a blood transfusion or surgery.
- Signs of infection: A fever above 100.4°F that occurs more than twice, chills, lower abdominal pain, and foul-smelling vaginal discharge suggest a septic miscarriage, which is a medical emergency.
- Severe or unusual pain: Sharp abdominal pain, shoulder pain, or pain when having a bowel movement can indicate an ectopic pregnancy, where the embryo has implanted outside the uterus. This is a life-threatening condition that requires immediate treatment.
If you’re experiencing any of these, don’t wait for a callback from your doctor’s office. Go directly to the emergency department.