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Eh, it happens. don't worry too much. Now you know for the future.
I would do a water change just to be safe. Then test it again in the am
I would suggest prime as a water conditioner because it also makes ammonia and nitrite non toxic for 24 hours. It's kinda added protection between the changes while in a cycle. If you left all the same gravel and decorations there is so good bacteria in there still. And leaving some of the chopped pieces from the old helps too. It shouldn't take too long for it to catch up