Questions like this are hard for me. I can't imagine the position you must be in, nor can I fully relate the challenge of raising that many children. My prayers and support are with you - and your husband!
I wonder if I could offer a different perspective by telling a piece of my own story. My first pregnancy was incredibly difficult! I threw up a minimum of 8 times per day. I was constantly sick, constantly exhausted, etc. Still, my husband and I had tried for over a year, and I was excited to bring a baby home. At our ultrasound, we found out that we were expecting not one baby, but two. The minute I heard, I started crying - and not because I was excited. I was petrified! My husband was out of work; I was working more than fulltime to help support us. One baby was going to be a stretch - 2 might just bankrupt us.
About an hour after our ultrasound, our doctor called and had us come back in. When we met with him, we found out that one of our babies had died at 17 weeks. The other was barely holding on. One week after our ultrasound, I was induced and delivered indentical twin boys.
Both were stillborn.
Looking back, I remember the fear and apprehension I had at the thought of twins. Now, I would give anything - absolutely anything - to have those precious baby boys here with us. They would be 2 this coming June.
I don't know if, at this point, you can really step back to see the full picture. But if you and your husband can for just a moment, think about what you are giving up. On one side, you might lose extra sleep, money, etc. On the other, you lose your baby. From where I sit, there is just no question.
I don't mean this to pressure you in any way, but sometimes, all you need is a little outside perspective. This is your baby. Don't let finances ruin that opportunity. Yeah, it's scary and yeah, maybe your life won't look the way you thought it would. But who knows, maybe it will just get better.