My husband has the cf gene

My husband and I are trying to start a family. His daughter from his previous marriage has CF. He has the common gene. His ex was tested for the gene and it came back negative but obviously she had some form of the mutation they just couldn't detect. I was tested and mine came back negative as well. Having seen the struggles that come with being a carrier of CF I really do not ever want our child to have to go through that. My question is...Is it worth just taking the risk and hoping that our baby does not have cf or is it smarter to look into IVF and other forms to avoid the possibility of that. Any opinions or advice is much appreciated!