I've had irregular periods since the age of 15 I'm 21 sexually active I haven't had a period in 4 months taken soooo many test negative! I'm not trying but O can't help but think I am when I'm nauseous all day (weak) to the point of fainting. I am gaining weight on my lower region only. Everyone around me always says I'm pregnant but I go to the doctors and the answer is no. I am not stressed or worried or anything no medications so what is causing all this also my breast veins were popping out like crazy and the nipple got huge even my boyfriend noticed.The only good thing about all this is my butt grew lol.