Tmi(no pic) boobs

Annelise • 24. Married. I have a 2 year old and 1 year old sons.
So Idk why I was look at my nipples but I noticed something odd. One of them looks all cracked an in the cracks are like a yellowish gunk that I picked out with my nails an it doesn't seem right. Should I get this checked out by a doctor? Does anyone know what this could be? I'm also pregnant an my nipples have gotten more red an bigger along with my boobs.