Worried and pregnant

ma

I think I hit my head while I was asleep so I woke up my head was kinda sore with a small knot... as I was feeling around my head I noticed I had a swollen lymph node on the back of my neck. I’m 24 weeks pregnant so I was freaking out because swollen lymphnodes usually mean your fighting off an infection, but I haven’t been sick at all? It came out of nowhere. My doc won’t see me until October. Am I overreacting?