Ok, so around August 14th (can't remember exact date, but it was 2nd week of August) I had sex for the first time after two years of celibacy. Now, my period is a week late. He used a condom and it did not break. Should I be worried that I am pregnant? Or is it normal for changes in sexual activity to delay your cycle? My last period started on August 1st and ended on Aug 6th. MY periods are usually very routine. Should I be worried?! I do think I will go ahead and take a pregnancy test to make sure.