Poor you, I am not surprised you are terrified. What a horribly difficult situation to be in.
I am struck by the fact that you say your partner doesn't want to terminate, not that you want to terminate. If you honestly can't imagine terminating, then don't. It is not something you should do if it isn't what you want.
You say "I wouldn't want to disrespect his feelings either and push him in to something that he's not ready for financially or emotionally" but what about your feelings about it, is he trying to push you into something you aren't ready for?
One thing to consider is that if you wait till your partner says he will be ready you will be 39, and there is a real risk at this age that you might have left it too late.
(I started TTC at 35 and am now pregnant, will be 39 when the baby arrives, fingers crossed. It is my 6th PG, I have lost the first five, and know from experience that it is often not easy to have a baby after 35 due to difficulties conceiving and miscarriages. I was not really aware that the fertility statistics decline as sharply as they do in the 35+ ranges and I wish I had more awareness).
Please keep posting here, there is a lot of support for you, whatever you decide to do.