Breast pain...

Vera • A wife and a mom to a beautiful baby girl (November 7th 2014) a rainbow 🌈 baby boy.(October 31st 2020) and now TTC last one.

Ok now I know I cant get pregnant after 51 days of no period but 2 days ago I noticed a pain that started near my nipple on my left breast it little higher then the nipple but the pain feels like a bruse after you been hit. I still dont see anything and it still hurts. I know I didnt hit myself or anything. Anyone have any idea what it could be?