Long 3 weeks

 Got a letter from dr saying I am a carrier for cystic fibrosis, and that my husband needs tested. Did lab work today but have to wait 3 weeks for results. If it comes back positive we will have a 1 in 4 chance of having a baby with cystic fibrosis. Has anyone else had this happen or know anyone that has? Please keep us in your prayers as well I am very nervous.... Thanks in advance