Hi,
I was on the pill for 7yrs. I came off it in December and I'm now 3 months pregnant. I wasn't exactly trying but we were happy for it to happen. I was still having a couple of large reds on the weekend and I was also still smoking at the time, neither was i taking any folic acid - as like i said i wasn't trying for a baby as such.
A friend of mine who fell pregnant a month before me was doing the same as me, she also stopped in december and had been on the pill for sometime. She didn't smoke but was still drinking etc etc.
Anyway, her sister has been desperately trying since September of last year and has done the whole trying to time it around her ovulation date, has stopped drinking, stopped smoking and has been taking folic acid etc and she's still to concieve.
I think what i'm trying to say is I think that what redcrx said about the stress can definately have an effect. I also agree with what red said before about coming off the pill sooner rather than later and usuing a barrier, just to get the pill out of your system and for your body to start functioning normally again.