Underside of entire boob sore

I’m pumping only since my daughter is in the NICU. I’ve had no issues so far (about 2 and a half weeks), but today over the past few hours my left boob on the underside has gotten so sore and hurts to touch it and when I stretch it hurts. My boobs looks normal, no redness or anything. It is slightly hard and aches though.

I pumped and thought maybe that would help but it still hurts.

Should I be concerned? Or is this a normal thing when pumping?

The only thing I can think of is I’m wearing a different bra today that has an under wire, but my bra isn’t that tight. The one I previously wore had no wire and was much more comfortable.