i have the mutation g155d and df508 and just had my son 3 weeks ago. i had been off of birth control for about a year and a half i think. although my hubby was gone for part of it between boot camp, mct, his training school and a deployment. we didn't actually start trying till he came back from his deployment last september. i started using an over the counter ovulation tracker and took robitussin to help thin the mucus. he got home the middle/end of sept. and i was pregnant the beginning of october. needless to say i was shocked, but happy. hope that helps a little.