Sore Breasts-please help

For the past few days my breasts have been incredibly sore, even to just touch. And I have a random sharp pain that goes through the right one every once in a while. 
​My period was two weeks ago and since I stopped taking my birth control it probably my won't come back until I start my new ones or until I gain more weight. It's impossible for me to be pregnant so it can't be that. I'm just a little concerned about it.