My period has never been regular but it seems to gotten a lot worse. not long ago i did no get my period for 3 months and after being absolutely positive I was not pregnant I went to the doctor. She gave me medroxyprogesterone a few days after finishing the ten pills she gave me I got my period like normal and maybe two weeks later got it again but a bit lighter but now the next month has passed and I am not getting it again. Is it possible that I need this at all times to get my period?