Bleeding in early pregnancy can be a scary. Unfortunately, it is very common and can have many causes, most of which are no direct threat to the pregnancy. These can include a vaginal infection, a urinary tract infection, and postcoital (after sex) bleeding. While bleeding can be a sign of a miscarriage, it can also be due to a subchorionic hemorrhage. Subchorionic hemorrhage, also known as a subchorionic hematoma, is a frequent cause of vaginal bleeding in early pregnancy.