Hey
Sorry to hear you're in this predicament!
I haven't been through the same thing but I'll tell you my experience (hoping it helps/comforts in some way).
I fell pregnant a month into dating my neighbour and had no idea what to do as I had never wanted kids. My then neighbour, now boyfriend, already has a daughter and loves kids. He persuaded me to keep the baby and although it was very soon, he reassured me that things would be okay and we could do it. So I did (and honestly don't think I could have gone through with an abortion anyway).
My son is now 11 weeks old and my boyfriend almost resents me. We have a very needy baby who needs constant touch to settle and sleep. When he cries, my boyfriend just expects me to deal with it, says it's ruined our relationship, makes little effort to bond with him and hasn't ever gotten up to do a night feed. So now I sort of resent him too....
And even though I was the one against having kids, I obviously wouldn't change it for the world and even though my relationship is on the rocks, I'm glad I made the best decision for my baby.
As hard as it would be for a marriage to end over a new baby, I think you've got to go with your gut. And if you are 100% against abortion, then you have your baby and don't let anyone make you feel that you are making the wrong decision as you know better than anyone else, husband included.
You never know, when your husband meets your brand new baby, he will most likely fall head over heels and forget every reason why he didn't want more!
This probably isn't much help but I hope it offers some kind of comfort and support.
A mum always knows what's best for their baby 