What a difficult situation, you have my sympathy.
Just to add my 2 cents' worth, I accidentally fell pregnant a couple of years ago. I was on the pill but, you know, these things just happen.
My BF was set against going through with it...he told me he'd support me whatever I chose but that, being honest, he wasn't ready to be a father, he didn't want a baby and he thought having a child would destroy our relationship. It wasn't a threat, it was a fact.
I hated the thought of having an abortion but hated even more the thought that I would bring a child into a world in which it wasn't wanted by both of its parents and would more than likely end up in a broken home. I also couldn't bear the thought of losing my bf and being a single mum. So I had the abortion.
In the end, though, I was so devastated by what I'd done that I got very depressed, gained weight, stopped taking care of myself and basically just checked out of our relationship, although I didn't realise it, and still loved him. BF couldn't understand why I was so low - after a couple of months he'd just forgotten all about it, and 18 months later it came as a huge surprise when I told him how much i'd been struggling - he was just oblivious, and I think that's a big problem for us women... men don't have that immediate bond so they don't understand.
In the end we broke up anyway. He resented me for 'letting myself go' and I resented him for not supporting me and recognising that I was struggling. As it happened I found out two weeks after we eventually called it a day (after months of torturing ourselves and each other) that I am pregnant again. This time, he's fully on board, and hasn't even mentioned the A word.
My point is, if abortion isn't right for you, you have done absolutely the right thing - it would probably have caused irrevocable damage to your relationship - and I'm sure your husband will come around and see that in the end, at least when the baby is born. Some people take longer than others to process and come to rational conclusions.
Good luck 