Any suggestions plz?

So in July, I was sparring with this guy at my gym in boxing, I’m a kickboxer and told him that I was new to boxing and we both agreed on light sparring, later on he threw a few punches to my sternum to be exact, that had a little force to them, nothing that hurts badly in the moment, but it just so happens that the same punches ended up bruising my chest and I feel a sharp pain when I inhale and move my chin down it’s been months and I still feel it, is there anything I could do to fix or atleast know I’m alright?