Sex after second trimester

I'm 25 weeks pregnant and ever since a couple of months, my boyfriend (also BD) seems to not be interested in sex anymore. We used to be active once every week at least, and he would initiate something if it went passed that time. Now it's like he's not even thinking about it. It's been a month already and I'm starting to worry. My sex drive hasn't changed since becoming pregnant, so what can I do for him? I'm afraid to do something and be rejected (I already feel like my body isn't attractive to him anymore, even tho to me it seems the same just with a belly)

I've made comments about this, and sometimes I make comments that I think would turn him on but he just smiles.