Sore breast for 4 days straight!

Bianca
I have been having very sore breasts for 4 days going on 5. I should start my period in about a week as of today. I don't wear a bra to sleep but lately when I take my bra off it feels better to leave on. I never really get sore breasts. Am I possibly pregnant? Or is it from change of birth control to a different pill? 

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