herbal remedies for miscarriage?

Hi there.

I recently found out that my pregnancy did not turn out as planned. I have miscarried, but my body has not been passing the remains very quickly at all. Does anyone know of a natural way to help spur this along? If it does not pass within a week, I have to schedule a D & C to have it surgically removed, and I'd like to avoid it if possible.

any suggestions would be greatly appreciated and researched.

thank you. :)