Is he acting normal otherwise or has he changed? It might be from depression, to anxiety, to being busy from work, to having another woman.
I am the total opposite. I definitely don’t be in the mood while my bf is always. We just communicate about it.. have you spoke to him about the need or wants that you may feel not being met?
So this can actually be completely normal when women get pregnant. I'm currently pregnant with my second baby same situation as urself both pregnancy. But my husband is so scared he could hurt baby or sperm send into early childbirth as well as a subconscious thing for men there drive will stop once they have gotten a woman pregnant bc subconsciously they have done there job. I looked into research on that with my first pregnancy everyone is different and only thing u can really do is just talk to ur partner and ask how he feels.