Having a miscarriage essentialy "resets" the timing of your period.
MD told us to wait two to three periods before trying to conceive again. We waited for two periods to pass then tried again and got pregnant immediately. My baby is due near the one year anniversary of my miscarriage.
I waited about three months because it really took something out of me. I was only 3months but I was so excited to be having a child that I already loved my child. It took me about 9 months after the miscarriage to conceive the child I am carrying right now.