Doing something that arouses pessimism while contracting a marriage
If the reality is as you have mentioned, there will be no blame on you for crossing your fingers together or for
popping them upon holding the marriage contract. Doing such things does not affect the marriage contract. You do not need to hold it again as it is a valid contract. Moreover, you have to give up superstitions because they contradict Islam. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.