Has anybody had a subchorionic hemorrhage?

i was told in the emergency room that my sonogram shows that i have a subchorionic hematoma/hemorrhage. i just want to know if this goes away? they also told me that the baby's heartbeat was strong,and that my HCG levels were perfect. but i have to see my OB/GYN doctor for him to keep an eye on it. i need answers. thanks