Well I haven't started my period while on the sugar pill and today, I'm about to start my 3rd packet of my birth control pill. I haven't had sex with my boyfriend before my I started my sugar pill, but I feel weird that I haven't started my period yet, and I'm about to start my active pill. Is it possible that I can start my period while on the active pill? By the way I did have sex while on my sugar pill but that was 2 days ago, but other than that I haven't had any sex 2 weeks ago because I wasn't with my bf those two weeks. So can someone help me? I always start a new pill week every Thursday and I'm off the sugar pills, I just haven't started my period and it makes me nervous.