22 weeks pregnant with a very high sex drive.

I am 22 weeks pregnant and never had a very high Sex drive in my life this is my second pregnancy and with my first I had no sex drive at all this time I have an extremely high sex drive . The worst part is my fiancé doesn't seem to want to have sex much anymore which is kinda odd because it's normally the opposite he usually always wants sex but now it seems like he hardly ever does and I don't know how to bring that back ( he's never told me he don't wanna have sex as much but he also doesn't really try to anymore ) and advice of ideas would be very helpful