We are considering witchcraft! Is this going to far?

I would have to agree with your husband. You don't know this lady from a hole in the wall. You don't know if the spell is evil or good. I believe that if the lord above wanted you to have children he will either bless you and your husband with the conception of your future child or he will bless you with the opportunity to adopt a newborn baby which is a blessing for many couples in similar situations. Please don't trust a wich with your future. Good luck in whichever you choose, lots of baby dust.