Sore boobs

Kathryn • Expecting baby no 1 in June 2016! So excited!!!!!
So one of my normal signs AF is on her way is my boobs get sore about 7dpo which continues until the end of my period! 
This month my boobs got sore again but today 13dpo the pain in my left one has stopped and my right one is less sore! Has this happened to anyone else?