Higher sex drive than my partner

Before me and my partner were officially together we had sex very regular long intense sessions too but now it’s once a week if I’m lucky.

We now live together and are expecting a child. He explains he’s stressed he says when I mention it it makes it less likely to happen. However he is very boob originated builds me up to not want sex and for last 2 months I’ve tried so hard not to mention it but no changes.

It’s gotten to the point where I’ll go to bed early to pleasure myself because I’m moody as hell and need a release. He thinks it’s the pregnancy hormones but I think it’s lack of sex simples. Im also starting to think maybe I’m just not attractive anymore.. I dunno just a bit shite

What should I do?