I've never been able to tell after ovulation, partly because I'm scared of damaging something. I'm not 100% sure it can hurt them, but it doesn't seem like a good idea.
I can usually hold my girls up and see the lumps from the eggs after ovy. Hold them right side up with front end in one hand and rear in the other. Usually better to hold the head in up slightly higher. If you don't expect them to be too far along, you can even hold them with their rear hanging if they are calm enough. If you see a lumpy/full appearance toward the tail end, I'd have the incubator running.
(This is of course assuming they haven't eaten in a while. I guess you'd get a pile of something either way)
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