Hi Melissa! For now, take a couple weeks off bench press and let any swelling or discomfort get out of there (however, continue to stretch your chest and shoulder muscles). After that, be sure that you are FULLY warmed up before doing your chest workouts. Once warmed up, stretch your shoulder and chest muscles really well. Then do a light weight bench press warm up set for 30 reps. Again stand up and stretch chest really well (place rt hand along edge of wall and straighten out arm. Slowly twist your body in the opposite direction of your straight arm, keeping your hand on the wall until you feel a nice deep stretch in your chest and shoulder muscle. Then gradually go heavier in your remaining bench sets. Also, do not lower your bar too far down. Keep your upper arm parallel with your bench height at the bottom of the movement.
Hope this helps!