is this your only hive? if not, and if you see no eggs on the recheck (tomorrow?), i'd take a frame of eggs from another hive and put it in there. if the queen is still there, no harm done. if she'd already gone, you have given them what they need to make a new one. it will also give you a good indication of whether you have a virgin in there that had just not started laying.
in the future, if you find queen cells, take the old queen and some brood, food, and workers. make a split. that way (hopefully) they think they have swarmed and you now have another hive.