Hi, My Name Is Jay. After Doing About 50 Push-ups

Hi, my name is Jay. After doing about 50 push-ups 2 days ago, my arm tightened up between my elbow and shoulder. Little pain when my arm is straightened but lots of pain when bending. All around constant pain underneath the muscle along the back of my arm from elbow to shoulder. Any idea what it could be? Feels like i pulled something really bad.