i'm not giving my age but let's just say i'm under 20 and me and my boyfriend stay the night w eachother almost every night and have sex and he cums all the time more than once, and I havent been able to get pregnant and we're trying to. I have a very irregular period that comes like maybe 4-5 times a year and I don't know what to do. I went to the doctor and have been put on birth control like 3 times and finally got off of it. advice?