hiya, ive heard it can tale years, but having said that.... i was on the pill when i got preg with my first!! i only forgot to take it a coupld of times! lol everyone is different
your best thing to do it find out when u are ovulating, u can get ovulation sticks, bit like pregnancy tests, and they tell you whether you are ovulating, there is only a few days of each month where u ovlulate,
they say its around 2 weeks after your period, tho again everyone is different
good luck! xxx