Swollen vagina 😩 (tmi but no photo)

So I’m 38 weeks and 5 days. I had sex today with my SO, we haven’t had sex in like a month. It hurt so bad like the hole not the inner part. Just like the entrance of my vagina and after we were finished, my vagina was completely swollen like a balloon and was so uncomfortable, I tried icing it and it helped with pain but not much of the swelling.. its been hours and it’s still swollen like a balloon 😭 anyone else experience this? My vagina wasn’t dry or anything so idk why this happened 😩