Emergency room visit

I ended up going to the emergency room yesterday because I had bright red bleeding. It was like the beginning of a heavy period. They took my blood, did an ultrasound, and sent me home after being there for 5 hours. They asked if I wanted a pelvic exam to see if it was opening, but I said I just wanted to go home. I see my doctor again Tuesday, and she should be able to tell me more then. They basically said that now I just have to wait and see what happens because it can go either way. This waiting is going to kill me. Has anyone else ever experienced this?? What should I expect??