Cognac, all your set-up plans, while helpful in having a healthy baby, are not what is truly important in bringing a child into this world. You are missing the one key ingredient at the moment. A stable relationship with your husband and a stable life. Make sure your relationship with your husband is going to go the distance in spite of JW issues. It is much easier if you end up splitting up when there are no kids involved.
Not that single moms can't provide a good life for their kids but it is tough for them. The ones that do the best are settled within themselves and have a stable lifestyle, even though single. Otherwise, you and your child are just surviving. It's not that you have any control over, or can change your parents and husbands belief, but you need to be settled with those relationships and content with them as they are and know that you can provide a good life for a child within the framework that presently exists.
How does your husband view having kids? Is he totally willing to not influence it to be a JW? If not, are you fine with hubby and parents having JW influence on your child? These are very important issues that need to be worked out BEFORE you get pregnant. If you can't agree now, it will be a nightmare after the child is born. A child can enhance a good marriage. It can also break a bad one. All it does is give you a myriad more issues to fight over if you have already have trouble resolving your conflicts.
I'm speaking from very painful personal experience here!
Cog (the other one)