Have you got someone with you Playing? Don't want to worry you, but if it is over, well, it can be very painful and seriously heavy bleeding.
FWIW, if you don't want to wait, go to A&E, it isn't unwarrentied at all, and if the bleeding gets especially heavy you'd be advised to.
If you think you may be up to a week behind the MW's dates, just obviously bear that in mind at the outcome of any scan.
Obviously you can take paracetamol if the pain get's worse, and a warm bath can help, other than that I've no more advice, there isn't much you can do but wait it out. I really would think about A&E though, 2 days is too long to wait, you're right, if it is over there is nothing anyone can do, but you'll save yourself 2 days of torture.