Anyone that's suffered a MC.. Please respond.

So.. We suffered a MC last month.. Very early on 3 weeks or so the doctor thinks. Lots and lots of heavy bleeding and clotting though sorry tmi!! Now I've been awaiting AF I did think it would be a little off.. But 2 weeks late now!! I have bad headaches, constantly drained, nauseaus throwing up now and again and a lack of appetite. I've done a clear blue and its negative. I'm so frustrated not knowing if AF is coming... When.. What!!! Ahhhh has anyone been through anything similar?? I don't know if it's even a possibility to get pregnant so soon or if I'm just so out of sync anyone shed any light?