14 weeks and heavy bleeding

I went to the ER for heavy dark red bleeding soaking through a pad and they found the baby’s heartbeat right away thank god. I followed up with my doctor right after and she has no clue why I’m bleeding! She said she saw a little bit of blood collection by the placenta but nothing crazy that would cause me pour out blood the way I was. My cervix is closed which is good and the bleeding has subsided a lot. It’s now a brown type of discharge. Anyways guys I’m just looking for prayers and well wishes that everything stays okay and it’s just a weird thing that’s happening. Or similar stories where everything turned out okay as well. Thank you guys