Arm Gland?

I had this bump appear in my armpit a week after giving birth and just thought it was a plugged node from breastfeeding but now it’s going on 2 months. I’m still breastfeeding. Don’t know if it’s related though. It’s SUPER painful BUT only if I touch it or press it. It is hard and I developed a crease too. I won’t have healthy insurance till mid January. Is this something I should worry about and go to urgent care? TIA