Sexually frustrated

I'm 23 weeks pregnant and finally got my sex drive back. I get so horny and turned on so I engage with my husband and it's great for all of 2 minutes then I completely get turned off and dry up. Then of course since I'm dry and turned off, the sex becomes painful. I've never had this problem before and I'm hoping maybe it's just hormones. But I'm also starting to realize that I'm just not attracted to my husband anymore. He's such a great guy and I love him more than anything, but he's really put on the weight. And just feeling how big he's gotten just completely kills the mood. We are both sexually frustrated at this point.

So, has anyone had this problem with getting turned off so fast? Is it just hormones? Should I bring up the lack of attraction? He's so self conscious about his weight already, I don't want to hurt his feelings. Any advice is appreciated! Thanks