Sore boob😓

Ella
So for the past week and a half or so my right Brest has been incredibly sore like even to the post if I reach across my chest and hit it my accident it's really painful.... Then yesterday I noticed my nipples are really sensitive and I haven't had sex in a month and a half and my period dosent start for another two weeks and I don't know what to do. Help? Please.Â