Ok so my gf has been on the pill for a while now and as far as i know takes it regularly and how she is supposed to take it. She started her period about may 29th. over the next month we had sex with condoms. but once in a while we would start a little without a condom but then stop and put one on. when she got to the pills where she was supposed to start her period she never got it. she has never missed one before she said. she had stomach cramps and her breasts were sore but there was no bleeding. is this common? it is now july 8th and she has not had it yet. is there a chance she is pregnant? i never ejaculated inside of her. she says she isn't but i am still a little worried. any advice? and what if a pregnancy test says negative. is that 100 percent sure she isn't then?