K.P.
It sounds like your husband's fear for your safety outweighs his interest in discussing another child. Think about how terrifying your pregnancy must have been for him. We often forget about their feelings b/c the mommy and baby(ies) are the focus. I had an emergency c-section and asked my husband afterwards how he felt and he used the words "terrified and angry".
It might help to have him speak with your OBGYN about the risks/likelihood of this happening again. This helped my husband immensely. We are starting to talk about our second child and he was very afraid that we would have another emergency delivery. My OBGYN sat with him (without me there) and explained EXACTLY how a "perfect" pregnancy can sometimes result in a traumatic delivery and that statistically it was highly unlikely that I would have another prolapsed chord, but that he couldn't promise that something else would not happen.
For my husband, having someone who wasn't emotionally involved explain the parameters really helped. If he still feels like this isn't the right thing for your family, you may need to let it go. He is your first commitment and whether or not you have more children is a joint decision. Don't nag him about it, but have an honest conversation about his fears.