Self conscious during sex while pregnant....

I am currently 22 weeks pregnant and I am having a hard time feeling relaxed when I have sex with my husband because I just feel really ugly lately. My belly feels huge, and all I can think about is how much weight I’ve gained and wondering if he’s noticed and if he still finds me attractive. He says it’s all in my head that I look beautiful and he’s still super attracted to me so I know it’s not a problem for him and that it is mostly in my head, but how do I stop stressing about it? I really really want to just enjoy having sex with him and not feel so self conscious.