After Seeker's, Eskie's, and Open Eyes' posts, I'm not sure what else there is to add.
I think it's a great thing getting involved in your church (though of course at this point, I'd stress not to overdo it

). Hopefully you'll be able to find some solace there.
I think time and your daughter's birth will ease the burden, particularly the latter.

Just focus on you and her. Your STBX's concerns can't be yours, even if you wished to help. I suspect the only thing that'll help him is time and knowledge, and I think he'll realize down the road he made an awful, awful mistake.
But I hope things go wonderfully with the delivery, and know I'm still keeping you in my thoughts and prayers.

Please do let us know when she's here, will you?