Is it normal to have pain or sore on breast after having sex? Me and my boyfriend have been dating for 3 years we've always had unprotected sex he has been my only partner now and the last time we had sex was a month ago but just yesterday we had sex again and this morning my breast hurt feel sore? I am a week late on my period . Is this normal? And while we were having sex I did not touch my breast so I don't understand the soreness and pain on my breast.