Im not pregnant because I've never had sex, but my abdomen has been like this for about 3 months now & Idk whats going on. Theres no pain but when I lie flat on my back its firm. I already went to the doctor & she thought it was because I was full of poop & prescribed me miralax but its been 3 weeks & no change. So what could it be? Im 16. Its making me really self concious because it makes my pants and shorts stick out, and I've been exercising everyday