I agree with Gordon far too early to tell if fertile or not.
When eggs are first laid they have a pinkish tinge to them. They then turn chalky white if fertile. They need to be at least three weeks to be able to see veins in them. Some take a little longer, as it also depends on the temps used in the incubator. I used to use 32.5 to get more female hatchlings. And within a month you could tell if fertile or not. Although I used to incubate all until the end. As there is always one egg that fools you:0)
If you incubate at lower temps, then it will be longer before you can tell if fertile or not:0)
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