How confident are you that you could spot eggs if they were there? They are extremely difficult to see and depending on your angle can be darn near invisible.I'm probably over-reacting.. I've just had some issues starting up this hive, so my anxiety is especially hight, praying these girls do their thing. . .next step... worrying about over-wintering, cross combing, feeding, etc, etc..
I have looked at a comb a couple of times before finally seeing them. It helps (I find) to blow gently onto the comb in the area you're looking. It temporily makes the bees get out of the way so you can get a better look. Then they cover back over shortly after.