About a year and 3 months ago I found out I had an cyst on my ovary. They put me on birth control. My periods always came on time after being put on the pill. I haven't had sex since march. I got my period fine for march, april, may, and june but not it never came july and august. I don't feel sick in anyway, no sore breast or anything. Wouldn't I be having symptoms at 5 months if I were pregnant? What could it possibly be?