Painful sex 18 weeks

Has anyone else experienced painful sex during pregnancy? We had sex last week and it was a bit uncomfortable but today it was just painful and we had to stop. It feels bruised inside, and was achy for about 30 minutes afterwards.

I’ve read online that this can be normal and due to the extra blood in the area etc but I can’t help worrying something isn’t right? My husband said it felt ‘different’ for him, like there is swelling 🤨