Sore Breast

Alysha

Before my last period one of my breasts and nipple became sore. Now it’s almost my next period but my breast is still sore and getting larger and my nipple still is extremely sensitive. Has anyone experienced this? Should I be worried? It is only one breast that has been effected. I am definitely not pregnant so it has made me slightly concerned because my period has passed and I assumed it would cease after my cycle.