Afraid I'm not going to be much help. @ronott1 has posted a picture but I can't tell the difference between the fertile and infertile. 

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Thanks maybe someone else will look. I thought maybe one of them had oneAfraid I'm not going to be much help. @ronott1 has posted a picture but I can't tell the difference between the fertile and infertile.![]()
On one of the last ones, on the right side it looks like a fertile embryo.
Do you have a smooth glass cup or bowl you could put them in? You could see the other side that way. The dot may be on the other side. I cant see anything. I have had chickens younger than that go broody, and hatch out healthy chicks. I hope they hatch for you!