You should really see your OBGY and get and ultra sound. I have PCOS ( polycycstic ovary syndrome) and endometrosis. I was having the same problem when I was in my late teens. By the time I sought medical care I had a cycst on my left ovary that was 15 inches long and 16 inches wide. I was too large to remove without taking my ovary. I later found my sister has PCOS as well. Any issue like this is usually regulated with birth control and often meds like prometrium are prescribed tomake your period start again. Make an appointment fast and make sure you keep your period regulated if you ever want children.View Thread