Anyone else super insecure while pregnant?

My husband and I went camping over the weekend with my parents, my parents friends, and some of our friends. I’m usually the life of the party when drinking, but being 30 weeks pregnant, obviously I couldn’t drink this weekend. I was getting kind of bummed watching everyone have fun so I went to bed pretty early at 11. One of our friends invited a girl my husband use to “have a thing with” they used to flirt and hangout before he met me. She arrived shortly after I went off to bed. I could hear her and my husband talking outside. I started crying and just felt so sad. I eventually fell asleep and then woke up at 2:30am freezing and my husband wasn’t in bed next to me. I got up and looked out the window and no one was at the camp fire. I went outside and found my husband in the girls trailer. Now they weren’t alone, a bunch of our friends and my step brother was there too, but the feeling I felt in my stomach is something I can’t even explain. My stomach and heart dropped and I haven’t gotten rid of the feeling since. I feel fat and ugly and he was drunk talking to this pretty girl who he used to flirt with and it really hurt me. I know I’m probably overreacting or overthinking and I should let it go but I don’t know how to make this feeling go away. Anyways thank you for reading I just needed to vent.