After my first m/c it took 3 months to come back. I started taking birth control to get my period back on track.
Faith, Hope, and Love. The greatest of these is Love!
TTC since 12/09
BFP 4/1/10 MC 5/20/10 at 11w5d D&C 5/21/10
BFP 12/30/10 Natural MC 1/15/11 at 6w2d
When I had an early miscarriage about a year ago, my cycle resumed just about immediately. If you are waiting and not having a period, you could consider monitoroing for ovulation with test strips There is significant variation in what is normal.
Re: How long