Lost mucus plug? Tmi

Samantha
Hey ladies. I'm 35+3 today and a few minutes ago I stood up and felt something kind of... Slide out of me. I was afraid my water broke or I got a good bladder kick and peed myself. When I went to the bathroom there was a big glob of mucus in my underwear. I wiped and I didn't see any blood. I'm now (an hour or so later) having slight cramps. I have a doctors appointment tomorrow, should I just wait? Does this sound like I lost my mucus plug?