Firstly, huge hugs. What an enormous amount of stress and grief you've been through or are going through.
Your husband, your life partner, is supposed to support and respect you. He is doing neither (in any aspect, including your business). He is not even coming to you with concerns in a logical way, he is being purely mean and nasty. I would be questioning my relationship with him, not the decision to have the baby. That would be a far easier one for me to make as I would never allow someone to bully me into aborting my child. But that's me.
Also, does he remember or realise it takes two people to make a baby? Considering his reaction and his views, was he taking the steps to ensure you did not fall pregnant? Obviously not. This is not your 'fault'. It takes two people to make a baby.