Brown spotting at 11 weeks, anybody??HELP

Naiara
We are moving to a new apartment and yesterday I was lifting and cleaning floors bathroom and stuff. I woke up this morning to pee and I saw on toilet paper some brown pink ish discharge, I freaked out and went to the ER.. I had no cramping, Doctor had me do a ultrasound and we saw our little one super wiggly, with a heartbeat of 168. They checked me and everything is fine. They don't know where the spotting is coming from. I've been bed resting and the spotting stopped. Any of you have had this problem? HELP!