Are you sure? I've just never seen a monarch lay the egg on top of the leaf. I'm not saying it is not an egg, but...hmmmm.... It also looks a little too round for a monarch egg....hmmmm
However, there are a couple other species that use the milkweed as a host plant, so it's possible that that's an egg of one of those......
Have you checked underneath the leaves to see if you see any other eggs?
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