First ER trip last night

Started bleeding very heavily and had blood clots. I am 14 weeks. Cervix is still closed, baby has very strong heartbeat and active. They are not sure what caused the bleeding and I won't know till tomorrow when I see ob. I am scared out of my mind right now. Anyone have this happen. I only bled for about 30 mins and then it stopped. Now I am on bed rest for a few days.