The first day of my last period was August 5th & my period lasted until August 10th . Mind you I don't have irregular periods at all.. so me and my partner had unprotected sex on August 28th & August 30th . We used the pull out method but we still think that it was a possibility of semen getting inside me.. It is now September and I was due for my period around the 5-6th and I still haven't had a period. I need answers..