going on everything ive read, all i can say is your a better man than me, if i had that happen to me i'd be out for blood.
fortunatly fate steered you in to some thing that, by the sounds of it, that is soooo much better for all concerned. you have a shot at being a dad, and have a commited relationship with a missus that understands you, all systems go hey much better way to bring children in to the world, ( seeing as you both want it)
cheers Mick