Right breast is REALLY sore, painful

And it's only the right one. It feels almost bruised and like full idk. I just started an antidepressant yesterday (Wellbutrin) is it possible it's that? I'm only on 75 mg and I've only taken two pills so far. 
I have had unprotected sex a lot this month but I feel like if it was pregnancy related it'd be both breasts idk. My left one does hurt but not as bad as the right. 
Should I be concerned?

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