maybe the baby bump is a turn off, because it's literally a HUGE reminder of how his life ( as well as yours) is about to drastically change. it could just stress him out? which would lower his sex drive. Some men have fetishes for pregnant women, others are disgusted. Which in my opinion is just as immature as a guy being grossed out by a woman having her period, or even bringing up the "P word" lol. Honestly If a guy didn't want me when I was pregnant, then I wouldn't want him to even touch me when I wasn't lol. But i also expect the same when I'm sick, not wearing makeup, and at my worst in general. If a guy wants the best of me well he better be ready to put up with the worst of me.

Anyways don't stay with the guy just because he's the father, or because you don't want to have a fatherless baby. If he makes you feel like crap about yourself, and on top of that doesn't want to be there when you are going through the TOUGHEST thing a woman can even physically go through (which by the way he had a part in creating) than ditch the guy. You should be with a man who wants all of you, even if your belly is sticking out, and you look like a beach whale lol.
I am also expecting by the way, and have had axienties about men not wanting me while I'm pregnant. But come on this guy is your husband, and father? correct me if I'm wrong here. I'm single so I kind have to put up with this factor, you have a husband, you shouldn't have to be putting up with it lol.

Your better off finding someone who loves you and wants you regardless
and is actually going to be there for you when the baby is born.
he can't honestly expect you to look like some god damn pregnant celebritity. tell him to snap back to reality, or your leaving him.
your man sounds like a joke. sorry to say. but let's be real here.