Searched for articles about ovulation after being on the pill, this one was somewhat helpful:
As I told you in my earlier posts, I was not ovulating before I got pregnant, obviously the reason I had to take Clomid. It's possible that I was not getting my period because I had been on the pill. I had been on the pill for six or seven years. When I went off of it I just never started my period on my own, until after this successful pregnancy. I started my period a few months ago and it is becoming more regular now. It is my belief that having a baby has "restarted" my system and gotten my period going. I was hoping this would happen, and it feels so good and....normal to have my period again.