Please tell me you've had this

I am 6w 5d. Last Tuesday I started spotting. This light spotting continued until yesterday when I started having heavy bleeding with clots. I came close to filling a pad in a day. Went to OB Thursday and baby was perfect. Heart rate of 140 bpm. After the heavy bleeding started I went to ER. Again baby looked fine and my numbers have doubled appropriately (2,100 on Tuesday, 5,532 yesterday). They did not tell me anything about hematoma or cysts or anything. Anyone had this that can explain why I'm bleeding but baby is healthy??