Painful sex

I’m 23 weeks pregnant and the last 2 times my husband and I have had sex it’s been very uncomfortable for me. We use a crap ton of lube, we are not rough ( my husband has a back injury right now so not even an option), and we have tried multiple positions. It almost feels like it burns then I am super sore. I have been to my ob this week and all my labs were normal so there’s no uti or anything like that I’m completely normal and healthy. We haven’t tried any new products it’s all been the same. Any suggestions on what I could do to make it more comfortable it is this just part of being pregnant and things changing down there?