DH hurt himself "down there"

Last Friday my DH was climbing down a tractor and pulled something in his right testie. He says that it just feels like a small dull muscle strain. His testicals are not swollen either.  He says that the only time it bothers him is when he walks/climbs. Sitting/laying it doesn't hurt.  He knows 2 people that had the same thing happen but 50x worse. He has a Doc Appt Friday. I hope there is nothing majorly wrong with him. Please say a prayer for him. Thank you.