Pain in Chest after p.e incident?

Friday in p.e, we played a really agressive game, i am very compettative and was getting really serious. I tackled this girl in my class, she probly 100-115lbs and she was trying to get up fast and ended up cputting her knee into my chest( my right breast) to get up. She succeeded at getting up by using my boob as leverage. After that occured i was in terrible pain, like when a guy gets kicked in the gonads. The pain went away 5 minutesvlater, but came back to haunt me mid satirday and now still hurts ( sunday) its going to mu underarms and back. Could i have done some damage or could it just be a internam bruise? Please help!:0