Subchorionic Hemmorage/Hematoma

I was diagnosed with this in the ER this past Thursday. It caused a very heavy bleed both on Thursday & Friday. We had two ultrasounds, baby's heartbeat looked good & it was very active, measuring 12weeks 5days, which was exactly what it was. That amount of blood was so scary, more powerful & heavy than any period. Anyone ever had this before? Doc said they commonly end on a healthy pregnancy & delivery.