Threatened miscarriage- What to expect?

M
I was in the hospital over the weekend with a "threatened miscarriage" which I am positive is, in fact, a miscarriage, but won't be determined until a second round of bloodwork. I have heard all the stories about how not to go by what the ER Doctor says and that some people end up being fine, but I just don't see a possible way that It's going to turn out that way for me. So I'm not looking for those stories. 
I'm specifically looking for what the next steps might be. I only measured 4 weeks and 5 days, but was suppose to be 6 weeks 4 days along. I know that I ovulated late and think that that could be the reason for the loss. Anyway, will my uterus clear itself out naturally or will I have to have a procedure of some kind? When should I expect to stop bleeding? It's been spotting besides on day of full bleeding so far. When will my next period show? And how long do doctors say to wait to start trying again? Thanks for your input.