It doesn't have anything to do with the pill leaving your system but just how fertile you are and timing is everything. Once coming off the pill, make sure you track your cycle and try and find out the average time when you are ovulating. The easiest way for me (besides getting major ovulation cramping) is to track my cervical mucous. You are fertile 5 days before ovulation and a day or two after. There's lots of info on the TTC Group. I don't have the link for you but I hope you can join! :)
Good luck!
I got pregnant twice whilst on the pill. But I'm sure it only takes hours-days I'm not to sure. But on my 3rd pregnancy (second child) I came off my pill want was pregnant within weeks. But it could take months to get pregnant. Good luck to you
Im not sure but I have heard of girls getting pregnant on pills. So hopefully soon. Good luck!