I was on the pill for nearly 8 years and came off it about 2 years ago. OH and i were TTC for about 3 or 4 months with no success. Then our circumstances changed and we decided having a baby wasn't right at that time so we started using condoms. Then, earlier on this year we had ONE careless night and bang, i was pregnant. It wasn't planned and we were still using condoms, it was just this one time we hadn't. I thought back to all the times we'd tried during the months after me first coming off the pill with no success, then it just happened from a one off. But i think the pill does take a while to come out of your system. I've had a history of pelvic problems and was convinced i wasn't going to be able to get pregnant but it happened for me just like that. If you're worried you can always see a doctor. I think they say that healthy couples in their twenties should try for a year to 18 months and before seeking medical advice xx