Myth: "It must be God's will."
Fact: This is right up there with "Everything happens for a reason." It's a trite cliche that does more harm than good. God did not create infertility and doesn't punish people with it. God does not desire infertility or any kind of suffering for us. Infertility is solely the result of one or more things going wrong with the human reproductive system. Infertility is such a spiritual battle anyway, please don't imply that fighting infertility is going against God's will. God desires healing and fullness of life for his children.