It depends on where the snake is inside the egg. I have eggs where I could see the embryo one day, and another day I couldn't because it had moved. I've also had snakes press up against the egg and give me a good look at their pattern. I hatched an albino last year in which I never saw the embryo inside the egg. All I saw were veins through the entire incubation. In the photo below, the dark mass at the bottom is what you're looking for as far as an embryo (day 26 incubation).

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