18 weeks & husband seems to be less interested in sex

So I’m 18 weeks and I’ve noticed as I’ve started to obviously show my husband doesn’t seem to be interested in sex at all. Typically I can make one tiny dirty comment or say something along those lines and it’s on. But lately I can blatantly be extremely obvious and talk about being turned on and it gets no response or becomes a joke. And I’m just referring to times I’m making a move. He hasn’t even attempted to make a move on me in weeks. Tonight I finally asked if me being pregnant was bothering him as far as us having sex and all he would say is “I mean it’s hard not to think about it sometimes”. He’s been so sweet since we found out and he’s more affectionate than normal in a sweet cuddly way but what do I do about the sexual part?? We can’t wait until this baby is born and I’m only going to get bigger obviously lol. Anyone else experienced this? Please no hating on my husband, he’s a wonderful man and has been great during my pregnancy. I honestly think he’s just thinking about the baby too much and can’t stop thinking about how it’s inside me so it’s deterring him from sex.