so, i have PCOS and have been changing my birth control from different brands till i find the right one. the last year or two, my doctor has been having me stack them, taking three months straight and one week off at the end. she put me on yaz less than a year ago and well, i feel like my periods have stopped. before, i just used to get that brown discharge, but now, nothing. yaz only has four days off so that might have something to do with it. i get like one massive cramp and i think i'll get my period, but i don't. is this normal? should i change my birth control?