Rash on breast during pregnancy, should I be concerned?

I’m gonna call my doctor Monday if this hasn’t went away, but should I be concerned? Did this happen to anyone else? I’m 19 weeks pregnant with my 3rd baby. My boobs have been hurting like CRAZY lately like worse than they’ve ever hurt during any of my previous pregnancies. Earlier I noticed a rash on my breasts it’s on both but particularly my right one which has been more sore than my left. It doesn’t itch or anything, it’s just tender and feels almost kinda bruised ? It’s only on my breast not anywhere else.

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