I have been on Sprintec for two months, going on three & I took my first white pill sunday which means I should've started my period, today will be the third day of taking the white pills and I still haven't started my period. My last period I had while on Sprintec didn't really change from when I wasn't on birth control as far as symptoms, but it was less than a week which was how long my periods usually were. I have recently been having unprotected sex & I don't know if I should be worried about being pregnant or if the birth control is taking effect on my period, which would be making it start later.. Someone help?!