This made me smile... cause it's too funny. ME giving advice about M and sex...
Ahh! ... but they are good suggestions!
Another approach could be to start off with something that seems innocent enough but has potential to lead to ... well you know. One that has worked very well for CAW and I is when she shaves her legs. CAW doesn't like to use a razor above the knee, she uses an electric razor, but has difficulting reach/seeing all areas, so I offer to do it for her. Get to rubbing a certain way and area, well you get my drift... Think you can ask H to help out?
Ooh! ... PnB its been a long time since I have felt I have to give you a whack with a nerf 2x4! As soon as you mentioned how he might feel rejected, whether intentional or not, he saw it as you projecting upon him how you expected him to feel. You threaten to steal his ownership of his feelings.
Keep to "I" statements. By explaining that you want to wait because you are concerned about your health during the pregnancy is enough of an explaination and let it drop after that. How he feels about it is up to him and you should allow him to remain an open book and not suggest how he might react.
There ... I hope I wasn't too hard on ya! I do feel a bit ornery lately.
As soon as you mentioned how he might feel rejected, whether intentional or not, he saw it as you projecting upon him how you expected him to feel. You threaten to steal his ownership of his feelings. 
I do feel a bit ornery lately. 
