Always leave eggs (unless they smell) until well passed hatching date.
This is for experience of looking at eggs and how they change.
I did breeding tortoises for well over 25yrs and still had problems sometimes with guessing if eggs were fertile or not.
But eggs chalking over is always a good sign. This is hard to tell until you have had a few clutches, as they change from a pinkish tone to white.
I have had eggs go well passed hatching date, cracked them open only to find a large egg sac with the hatchling. Mostly I have managed to keep them going until the sac was absorbed, but some died.
Its all a learning curve:0)
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