Not sure what it is?

This is kind of embarrassing... but the last couple days (today has been the worst) my nipples have stayed extremely hard and incredibly sensitive all the time. I have work a bra and before, during, and after I take it off they’re so sensitive to the touch and like sore almost. Does anyone know what this could be from? I’m not due to start my period for another week or two. Or does anyone have suggestions how to soothe the soreness?