Pain under ribcage right under pectoral muscle?

On Friday I maxed out on power clean squats and bench and was fine at about 8 in the morning later that night at about 11 I got a sudden sharp pain right under my ribcage on my right side and right under the pectoral muscle. I had a sharp pain when making even a tiny breath. The next day it was worse my mom thought it was a gas bubble but nothing helped I took tums and gas x and they did nothing. This is the fourth day and it still hurts to breath but not as bad so I tried lifting weights because I have mandatory football workouts and the coach gets mad if you don't go and it hurt really bad so I'm just curious if I pulled a muscle or something else and what will help?