AF cramps at the time of implantation have ALWAYS been a sign of pregnancy during an IVF cycle. I hope it's the same for you. Of course..it could go either way..but I can't tell you the # of people that had AF cramps and thought it was over only to wind up pregnant. Don't want to give you false hope but AF like cramps are a known pregnancy symptom. In any case...you have made it very far..if not this time..you will catch that golden egg the next time. GL!!