Sex life getting boring

I am 28 weeks pregnant and ever since i got pregnant my sex life has decreased dramatically. Not because i didnt want to,but because i feel limited to what i can and cant do and i started to realize my fiance only wants to have sex if it envolves pleasing him first. Some times i please him just to have sex but deep down i wish he would touch me more the way he always requests from me :( idk what to do . He isn