As if you didn't have enough to deal with right now!
It sounds like you and your husband might need to take a little time out to talk some things through. Perhaps you're not really on the same page with this, and I think when you're pouring your heart and soul into something that should be done as a partnership, then it's important that you understand each other.
Sometimes it's hard for the partner to understand, because they aren't the ones really doing anything. They can feel left our, powerless and useless. And sometimes they don't really believe that it's necessary. My husband still insists that there's nothing wrong with his sperm.
I can see this is really important to you and I hope that you guys figure this out and make it happen soon. All the best