Heyyya
I went through the same kind of thing although i didnt get rejected as such, it just never really seemed to happen, and i wanted to SO badly!!
But when i spoke to DP about it..he said it was because he now felt weird about it, kinda like DD knew what we were doing, or that she was in the room. He said it freaked him out. I believe this is a common feeling between males and sex at this point of pregnancy, esp coz they can feel them sometimes (but usually there is a logical explanation).
Im sure its the same situation with your DH, he just probably thinks he will sound stupid if he told you. Its got nothing to do with your body repulsing him i bet

Maybe sit him down and talk to him about it again, maybe suggest he feels this way and that you understand how he must feel, and that its completely normal for him to be feelings that way but you have needs to and its not going to hurt anyone if he tended to them once in a while. Maybe confide in him how his excuses are making you feel like he is repulsed by your body.