I'm sixteen, seventeen in two weeks, slightly overweight but very healthy. On July 2nd I had unprotected sex with a guy who has gotten other girls pregnant before. I've taken three pregnancy tests, all of which were negative, but the only period I had lasted about four days [when it should have been seven] and was so light that I didn't need to use anything until the last two days, that was also two months ago. I've been having cramps, very tired, very moody and have gained a few pounds. My mom refuses to take me to a doctor, but I really want to know what's wrong with me.
Oh, and I do know that stress can throw a period off. I wasn't worried until early September when I realized I hadn't had a period for two months.