I've heard it can take 3 months to a year for your period to return but I've heard that some women get pregnant before their period is to return. I had irregular periods and needed to clomid to conceive because I wasnt ovulating. You wont get pregnant unless you ovulate which means you most likely wont get your period. Trying to conceive and not getting your period regularly is so stressful ( I had up to 90 day cycles). Just keep trying and if you dont get it within 3 months, talk to your dr. Someplaces dont help with fertility til you;ve reached a year of trying or sooner if you have messed up menstrual cycles or arent ovulating. Somethings that can help though are to stop all caffiene and sugar subsitutes. Start taking your prenatal vitamin now make sure it has folic acid in it. I dont know about your current body status but if you have extra weight loosing at least 10% of your body weight can help. I wouldnt worry about no period yet unless it hasnt come in 3 months of your last pill. Good luck and I hope Aunt flo comes soon :)

You should see your doctor. Actually the most fertile time for women is coming off the pill. While on the pill you don't release any eggs, so they have been stored up and the pill preps your body to get pregnant.
I used to think the opposite, so when I went off the pill 9 years ago to ttc I thought it would take 6 months, nope got pregnant right away.
An appointment at the doc will shed some light onto not ovulating, and maybe there is something else going on.
Good luck and I hope that everything gets figured out really soon!