New pain near cleavage 2 months post augmentation. Should I be worried?

Hi, I had submuscular silicone gel breast augmentation 2 months ago. I was doing great, no pain, wearing normal bras and doing my massages as instructed. As of about a week ago, I have tenderness near my cleavage on the left side, by the breast bone. It is worse in certain positions, and when I press on it, but the breast itself looks and feels identical to the other one. My two year old did elbow me so maybe thats all it is but the pain hasn't gotten any better, so I'm starting to worry.