That isn't remotely how that works. There is no circumstance whatsoever where your child has a 5 percent chance of having CF.
CF is a homozygous recessive disorder. Both parents have to contribute a defective gene in order for the child to have CF. If one parent is a carrier and the other is not, there is zero chance of the child having CF, barring random mutations which have been known to happen. If both parents are carriers, there is a 50 percent chance the child will be a carrier, a 25 percent chance the child will have no defective genes and a 25 percent chance the child will have CF.
If you actually have CF, you have two defective genes and you can only produce children who are either carriers or who have CF, depending on the genes contributed by the other parent. If the other parent is not a carrier, the children cannot have CF.
As someone who both has CF and has raised a child with it, I absolutely do not want more children with CF. It's a horrible burden for the parents and only a deeply sick sadist would wish such a thing upon their child.
I have never lacked for male interest. I don't know why the hell that is because I'm quite open about my medical situation. I am now menopausal, so it is a moot point. But I absolutely spent some years agonizing over how to screen out CF carriers from the dating pool. Having another child with CF is one of my worst nightmares. I would rather be taken out and shot.