I'm only 19 so could it just be that they're still growing?  The worst part is close to under my arms. It's like a stabbing/throbbing pain. I can't wear a bra because of the pain, anything touching them hurts. My shirt rubbing against them hurts. You would think pregnancy right? Well I'm on birth control that stops your period for 3 months so missing a period can't be a sign because I have 2 months left. But I went ahead and took 5 tests over a period of a week and all negative. Should I take a trip to a doctor? . (I'm adding on here that they are hot like they have fever in them)