... out before my period so i know what to do. my doctor perscribed me microgestin 1/20, according to the instructions that came with them it says to start taking it within the first 24 hours of starting your period, then says to take in on the sunday of your period, so im kind of confused when do i start taking it within that 24 hours or on sunday? and also why is there only 3 weeks worth of pills? if im supposed to start taking them when im on my period am i going to go a week without taking them and no period or will i have to until my body sorts out a better time frame?