Even though it was really (really, really!) hard, we decided to wait until after my 1st AF. I even asked my doctor at my appt if it was okay to go ahead and try, but he really said it was best to wait.
The 2 reasons he gave were 1) to be able to accurately date the pregnancy (not really an issue for me since I know when I O) and 2) to let the endometrial tissue fully heal, especially since I had a D&C. I decided to wait, solely for reason #2. For me, I would like to make sure that when I do get pregnant again, I don't start out with any "strikes" against me
That being said, I know some women on here whose doctors said that they didn't have to wait at all. So...If my doctor had said that, I probably wouldn't have waited

All in all, I think it is totally a personal decision.