I think a lot of us here in this forum are probably in or have been in this very situation.
My son is 3-1/2 months old and I KNOW I want another child. As devistating as CF is, I would rather leave having another child in God's hands. If he believes that I can handle another child w/CF, so be it. I love my son, and would love any other child just as much.
I know there are ways to get around it w/IVF, but if I am going to spend that kind of $ on something, I would rather spend it to adopt a child that needs a home. But, I would do that if it came down to me not being able to have another child, which at this point of time isn't know to be the case.
I also think of things in a different light than a lot of others do... CF is just ONE of MANY things that a baby/child could be born with or develop, so there is always a possibility that something else could happen, even if not CF. Which is why I am opting to put it in God's hands as to what kind of child I will get and if that child will have an obstacles like my DS has now w/CF.
Good luck!