Is it breast soreness or pregnancy!?

Bailey
So I had sex with my boyfriend on August 17th (used a condom) and I had my period on August 1st-the 6th. Well I'm supposed to start my period within a week and the sides of my breast are kinda sore. It's very mild. But I just don't know if it's because I'm gonna start my period or if I'm pregnant... Help??

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