I was running and slipped in mud. In an attempt to avoid falling I put my foot out and it rolled toward the inside of the leg (right one). My body weight (165lbs) went on it and during the roll there was a loud pop. Afterwards I could walk on it but with discomfort. The next day I am able to walk on it but with medium discomfort. There is minor swelling around the ankle with minimal bruising at this point. How can I tell between a sprain and a fracture/break? Thanks, Mark.