Subchorionic hematoma is a condition characterized by bleeding between the placenta and the uterine wall. It can cause heavy bleeding and concern during pregnancy. Common causes include implantation bleeding or blood vessels rupturing. Symptoms may include vaginal bleeding, abdominal pain, or no symptoms at all. Bed rest is often recommended to reduce activity and pressure on the uterus, allowing the body to heal naturally. Other treatment options may include medication to prevent contractions or surgery in severe cases. It's important to follow your doctor's advice and attend regular check-ups for proper monitoring of the condition.