I have been on birth control for three or four years now. The last time I had sex was the day before I started my last period. I didnt start my pack on Sunday cause the pharmacy didn't have my pills ready so I had to skip that whole week but started back on the following Sunday. I skipped most of my sugar pills but my period should be coming now but hasn't yet. I have seen little spots of blood but nothing serious. Could I possibly be pregnant?