Happy to help! 
I'd take it out of the cup tomorrow (it may even flop out of there on it's own when it gets stronger). The duckling is still inside the egg in the cup right now, right? By tomorrow the navel should definitely be closed up and duckling hopefully more active and moving around.

I'd take it out of the cup tomorrow (it may even flop out of there on it's own when it gets stronger). The duckling is still inside the egg in the cup right now, right? By tomorrow the navel should definitely be closed up and duckling hopefully more active and moving around.