Hi there,
I'll share my story and hopefully it will help you out <img src="i/expressions/face-icon-small-smile.gif" border="0">
I am in a same-sex marriage, so in order to have children we had to look into using a sperm bank. Since I am the one with CF, we chose my wife to get pregnant, since I was not sure how my health would do with a pregnancy. And 4 years ago we had our son.
But then I had the overwhelming want to get pregnant as well. After looking through all of my health concerns, we talked with the sperm bank. We found out the sperm donor was tested for the top 89 mutations and came back negative. So we were certain we were in the clear. So 2 1/2 years ago I gave birth to our second son.
However, just recently my younger son was having problems with bronchitis. After doing some research, we found that the chance he could have CF is something like 1 in 500. So about a month ago we sent him for a sweat test (which was negative) and Ambry genetics test to see if he has 2 mutations (results still pending).
So the point of my story is that even though you should be fairly safe with the testing of the common mutations, there is still a chance for rare mutations. But since you are just a carrier, there is a much lower chance for having a CF child when compared to me, as my biological son was guaranteed to get a mutation from me, which is not the case with you. I would say that you are probably fairly safe, but if you really want to know the actual statistics, you will have to ask the medical professionals and/or do some research.
Good luck with your decision!