Multiple eggs in many cells means an awful lot of eggs for one laying worker. Think here the queen is fed by attendants fairly continuously to lay typically 1500 per day (2/3 of a frame side, if a deep National). Bear in mind this could be three days laying, mind. But a laying worker would start relatively slowly?
So the upshot is that their are likely numerous laying workers for your scenario - but all started laying at exactly the same time? Probably not! So more likely a new laying queen with either no prepared space to lay or not yet got the hang of things.
Next is position of eggs in cells. Queenie will get nearly all of them at the bottom of the cell; laying workers probably won't manage that.
Probably most important is laying pattern - if in a fairly compact laying pattern ( like pretty well solid), it is probably a queen. Laying workers generally lay all over the place, missing lots of cells and not in anything like a compact pattern. Queens lay on consecutive frames too, not dotted around on several frames.
So back to you. Have a proper look and make a decision.
There is usually a queen present. Losing a queen on a mating flight is not such a common happening.
I would guess and say it is a queen. But only a simple guess on the information supplied.
You need to think a bit more of what to expect before inspecting if you are going through colonies in that situation. Like time of inspection, aims of inspection. Just looking for a queen is a waste of time and effort as well as possibly disruptive to the colony. That is when a virgin or not-yet-laying queen can easily be lost as she may be flighty and also in an unexpected location within the hive.
Only a very few more days and the brood will be capped, so that may well give an indication? A simple decision initially - drone or worker brood - might be the obvious solution to the initial posting. It may not, of course, but by then the laying pattern will almost certainly be obvious.
Keep it simple is my advice.