Okay, so last month me and my girlfriend had sex, (she is on the pill, and has been on it for 6 months, and before that she was on it for like a year or something) and we had sex about 5 hours before i started my monthly, and i got my period, it was ful, bloody and heavy, lasted normal time, she hasnt missed a pill, and we waited two weeks and took two pregnancy tests, one at night and one in the morning right after she woke up, they both came up negative. Shuold i still be worried? or am i safe?