Red spot warm to touch above nipple?

I woke up this morning with my right nipple (skin above it) bright red, sore, and warm to the touch. There was nothing wrong when I went to bed. I'm 33 weeks and started leaking at 30 weeks. I have an appointment in a few days but was hoping someone could tell me what this could possibly be? Google is not my friend and has now convinced me I have breast cancer. Can you get a clogged milk duct while pregnant? 😩