VERY swollen gums

So I called my dentist today and got no answer and I was wondering what could I do in the meantime until I can get to the dentist because my gums are killing me! One side of my mouth where my top teeth are I got a tooth pulled a while back and I guess I bit down on something sharp a few days ago now the entire side of my gums are swollen only on the top not everywhere. Closer to the roof of my mouth and where the tooth was pulled. It’s extremely swollen and hurts. It’s giving me headaches and the pain is causing my neck to feel sore on that side. I feel like crap and idk what to do. Can I gargle warm salt water or is that not safe? What can I do until I can see the dentist? 10 weeks pregnant