How to be sure my ducks eggs will hatch?

Hi I have a mating pair of ducks and the momma has come up to the barn and laid two eggs on the floor of the barn there is no other live stock in the barn only the ducks so should I leave them alone or should I make a nest box and move them. I don’t want to touch them if there’s a chance that she may not take care of them or should I wait until she has laid the last one and take them and incubate them my self. Please help I would love to see the eggs hatch.

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