Discontent husband

I’ve been more and more tired being 30wks pregnant. My husband complained to me this morning that sex has become “stale” the past month and a half. We still have sex 4 or more times a week but it’s hard for me to do very many positions. I still try to get into it even though I’m not as horny as I used to be bc it’s so much more work now and I feel like a little buddha with this round belly I got going on. I feel like I’m trying my best and it’s just not good enough anymore. He said he doesn’t looks forward to sex as much anymore bc I don’t surprise him and get all dressed up in lingerie. I really am struggling with my body image right now and trying to be sexy is honestly hard. I just feel depressed now.