Feeling Unsexy

I'm 6 and a half months and since I've gotten pregnant my boyfriend and I have had sex 5 times if that. He is amazing and extremely supportive and has been to every appointment. He is also more affectionate towards me now that I'm pregnant. HOWEVER he just does not want to have sex. Its so annoying. I've told him about it and he just says he doesn't feel the urge now. Do I seriously have to wait until after I give birth? What should I do? Can anyone relate?