So I'm 20 and I've been on the pill, Trivora, for 4 years and my last month on it was July. I know it's said that you might miss your period for a couple months, but I got a regular period the next month. Now I'm late, is it possible to get one regular and then start missing? Also does coming off the pill change your fertility cycle? I had unprotected sex but we didn't finish and according to ovulation calculators online I wasn't fertile that day but I don't know if coming off the pill would change the days.