Dear S.,
I know exactly how you feel, I lost a lot of children to miscarriage - it is a very difficult time for us - our minds and bodies want us to have children and it is hard to invest more time in waiting.
I didn't know all of that stuff when I had my bout with this problem. Try to calm yourself. Be as much like your name implies as you can. The more time you give now, the better chance you have of giving live birth later on. I don't know how much later on, but in a few months, I guess.
You may need to ask the doctor if you need to have a D and C. I do not know the proper name, something like Dilitation and Curratage - cleaning out of your uterus. I had a couple it is not bad, just a bit of cramping the next day. Then you know for sure that no material is left in there. Maybe that is highly unscientific, but I do know that Moms think about that, I did.
Good Luck with this hard time, and take very very good care of yourself and your feelings. C. N.