Breast pain after period?

Hi! So, I'm still getting used to sudden pms symptom, breast pain. And after my period finishes it goes away. But this time, it did stop but now, 1 week since my period my breasts started to hurt again! What can be the cause of this? I did have protected sex, but even if I was pregnant, it was 5 days ago, I couldn't possibly have this symptom that fast. What do you think breast pain after period is related to? Can it be dangerous?
Breast pain after period?
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