I wanted to change the date I had my period because I was seeing my boyfriend for the first time in two months (he's in the military). After my period (placebo pills) I waited an entire week to start a new pack. I took all the pill correctly after starting the new pack. I saw my boyfriend 4 days after starting my new pack. We had sex, but used a condom as a back up. Now I am at the end of the pack (placebo pills again) and usually I start my period on the 2nd or 3rd day of the placebo pills. My period has not started. Am I late because I am pregnant, or am I late because I delayed starting my pills and the hormones are messed up?