Fell on neck, did i bruise my rib?

So after being in a cast for 3 months i returned back to cheerleading. I threw my back tuck (not the best idea) the whole thing was just off and i fell on the back of my neck. Nothing hurt that bad right after but its been 4 days and i have pain in my chest, where my ribs are in the front are swollen. It hurts when i press on it, sneeze, get up from laying down and stuff like that. So i'm wondering what i did to it.