So I read it in an article. It was about eggs reacting to temps and there were a few things I remember... one that you can still eat an egg up to like 7 days of incubation if it’s infertile.
one of the others was that after a certain point, I felt like a midpoint, you could not check to see if a non developing egg had ever been fertilized because the blastodisc will be gone. I’ll have to try and find it now I’m curious too. I’ve actually never opened a clear egg during incubation myself so I have no idea.