aubra birth control help!!!!!!

I am on aubra birth control, and as most of you know(those of you that take bcp, there is a white pill and a reddish pink pill known to be taken when on your period) I am on week 4 which is the week of the pill that I'm supposed to take when I'm on my period, but i haven't gotten my period! So I'm so confused and I don't know what I'm supposed to do? Am I supposed to open a new box and continue taking the regular pill, or am I supposed to take the "period pills" even though I'm not on my period.