Unprotected sex 2 weeks before period. Period came and wnt like it always is. But my breasts have continued being sore before andeven after period. Why?

Possible pregnancy. Sometimes bleeding will occur in early pregnancy, and even be heavy enough to look like a normal period. The breast tenderness could be a clue to an early pregnancy, so do a pregnancy test to be sure. If you are not pregnant, the breast tenderness will likely resolve on its own. Avoid caffeine to help reduce breast tenderness.