i missed a few of my pills at the start of the pack and had unprotected sex.about 9 days later i had what im sure was implantaion bleeding,it started as light pink and turned dark brown and lasted about 2 and a half days.so thinking i could be pregnant,i stopped taking the pill so then a few days later i got a realy heavy period.and not due a period for another two weeks.so i know the period was from coming off the pill,but does that mean i cannot be pregnant? i have all the signs and symtoms of being pegnant.too early to test.can anyone help?