I am an 18 year old male who looks pregnant. please read description (fitness, stomach, weight loss)?

Last year I gained 20 lbs of fat from taking a prescription drug that stimulates appetite (Megace) and of course, eating. After I discontinued the drug, I exercised and lost all of that weight. I have been running and swimming for almost 6 months now, but I still have what appears to be a beer belly. I have been tested several times with calipers, which confirms that I have 7.5% body fat. I think I stetched my stomach wall. Any suggestions? Thanks