Mild/medium pain in right side, mostly when laughing, coughing etc.

Hi there! I want to thank anyone who replies in advance, so many thanks! I am 12 years old, a girl and on Tuesday morning I noticed a pain in my right side. It is just above my hip bone and started off just hurting when I laugh, cough, sneeze or hiccup but now hurts constantly. I thought it could be because I was doing cheerleading on Monday and I ended up in a weird position on the floor with a friend on top of me, but not sure. I don't think it's a cracked rib, it's not excruciating but enough that I am trying to avoid laughing, couching etc because there is a fair amount of pain. I have had no pain medication yet, but think i'm going to have to soon! Oh and it hurts more if I press down. Thanks again xx