I was supposed to get my period yesterday and still haven't gotten it. last month i got it 2 days before i was supposed to get it. i'm on the pill.

Irregular periods: Don't worry too much. Even while on the pill, many women do not have completely predictable menstrual cycles. It can vary by a couple of days before or after the expected date, especially in younger women. If you are sexually active, it is always worth checking a pregnancy test if you have any doubts. Try to be consistent with the time you take your pills each day.