Help it's kinda Tmi

I've been having a problem, so I give my boyfriend head a lot. I dont want oral back it's been an agreement for a while. But I'm 37 weeks pregnant and hes been less to touch me but I still blow him. He says I'm too far along for sex and i get that I do it's just we don't ever have a romantic night where he tries to seduce me and get me in the bed. I'm not sure why, could it be that I'm pregnant? He says hes totally fine with me being pregnant but it seems the further I've gotten, the less touchy hes been towards me. What should I do? Any advice?