I'm 16 and have had a very regular period since I was 12. I've nevr missed a month nor have I been a light flow type of person. About a year ago I went on birth control to keep my cramps under control. My period seemed normal but eventually got pretty light. Last month, when I got to the iron tablets where you're supposed to be on your period, I didn't start. It's been a few weeks now and I haven't started a new pack and I still haven't started my period. I'm a virgin, it's impossible for me to be pregnant, but is it normal for your period to just stop??