I don't know about no longer being in peri but I had exactly the same as you,my boobs suddenly got really sore,so bad that I had to stop running,that lasted for a couple of weeks or so,then I noticed they just weren't as full anymore,not that I have big boobs,only a b cup but they have definitely lost their fullness and just kinda hang there now,nothing to worry about I'm sure but no harm talking to a Dr about it if you're worried