He says it’s not me :(

Our sex life use to be amazing ttc. 2-4 times a week. Now I’m lucky to even get it once a week. I’m 16 weeks pregnant and it’s really screwing with my self esteem. He still touches me and grabs my butt but before I would turn him on in the shower or with a really slow kiss... now it seems like he doesn’t even like the idea of sex. I did talk to him and he says it’s not me.