How do I become comfortable

I have always been insecure about my body especially more when I found out that my husband watched porn. Now that I watch my body change and seeing the stretch marks that I’m getting and seeing my belly grow. It makes me sad that I can’t enjoy my pregnancy because I’m so insecure about my body. I also feel like my husband doesn’t want to touch me anymore we used to have a lot of sex and now it’s rare when we have sex. Do you think that it’s because of my body that doesn’t turn him on? How can I change about being insecure about my body?