Even though subchorionic bleeding doesn't pose an immediate threat like other types of vaginal bleeding, you should still follow up with your doctor. Call your doctor whenever you experience any bleeding or spotting. If the cause is unknown, an ultrasound may be performed to rule out hematoma.

Is a subchorionic hematoma considered high risk?

Small and moderate hematomas often go away on their own. Larger hematomas are more likely to cause problems. There is a higher risk if the subchorionic hematoma is detected in the first 20 weeks of your pregnancy. You should seek treatment as soon as possible for the best possible outcome.

How often does subchorionic hematoma result in miscarriage?

While 13 of 44 pregnancies (29.5%) with subchorionic hematoma resulted in miscarriage, 25 of 198 pregnancies (12.6%) without subchorionic hematoma resulted in miscarriage (p=. 010).