When a gecko is about to lay eggs (like 3-5 days before), her organs will be pushed to the front of her belly (making her belly all dark) and you will be able to see dark red veins on the eggs (see pic that I'll put at the bottom).
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I can see the red veins tonight, so she is due within "3-5 days." DrCarrotTail also provided a similar example. Thanks for the great pics and info, everyone!!!
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^^Actual wording of Dinosaur's and DrCarrotTail's original posts are edited to paraphrase, highlight, and add details to the information I am referring to here.
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