As already mentioned, hens don't always lay like clock work.
So... a different amount of eggs doesn't necessarily mean anything.
But... occasional flock inspections are important. So... I would suggest you do one of those,, and see how everyone looks..
Often, it is easiest to do part during the day, and the other part after the flock roost for the night.
So... daytime inspection:
Just sit in a comfy spot and watch them... maybe toss out a bit of scratch.
I find i need a notebook to make sure I looked at all of them... and often a camera is good since they tend to move faster than my eyes can focus.
Look for:
Leg color
Swollen joints
Limping/odd movement
Lifted up scales on legs
Bright clear/clean eyes
Good comb and wattle color
Clean back sides
And sign of anyone getting bullied off of feed or water
Then, at night:
Feel the breast bone to make sure that they are in "good flesh" not too skinny or too fat.
Also, pick up a few and look very closely around the vent and under wings for external parasites.
Here is a keel bone diagram from the internet. You are aiming for # 3.
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