I have been on alesse birth control for about 4 months now. I take my pills every single day and I have never missed a day. 6 days ago, me and my boyfriend had unprotected sex. Today, I am 3 days into my placebo pills and it is almost the end of the day and I haven't gotten a period yet. Every other month I have gotten my period on the 3rd placebo day like clockwork. Could I be pregnant?