worried mama

im 11weeks 5days last night i woke up from a nap with my son and stood up, thought i had an accident so went to the bathroom to pee turns out i was bleeding alot. never enough to fill a pad at all. i called my dr anf went to the er they did a pelvic exam anf said ny cervix was closed and my hcg levels were over 77,000 and they found babies heartbeat. they want me on bed rest. i go to see my ob dr tomorow to redraw hcg levels and have her check me. im in zero pain and haven't had any cramping. my bleeding today is considerably lighter and only whrn i wipe. whats going on?!