Are my eggs fertile?

[adrwoolf]

Hello, this is my first time incubating duck eggs and I need some advice. I have gotten responses from “sorry, your eggs are duds”, to “yes! They are developing nicely!”. I figured this would be a better place to go to. Below I have attached eggs 1-8. Egg 1 has a detached air cell, so that one I know will not develop. Egg 4 and 8 I think are good. I have egg 4 in the second to last picture and egg 8 in the last picture. Please let me know how they look, at least eggs 4 and 8! Thank you!

 

[OneHappyDuckie]

How long have they been in the incubator?
Can you take pictures of all the eggs like you did for the last one? Holding the egg with the lights off?

 

[adrwoolf]

How long have they been in the incubator?
Can you take pictures of all the eggs like you did for the last one? Holding the egg with the lights off?

Today would be day 4. The only one that looks like it is developing is #8. They are in order. #8 has what looks like veins.

 

[OneHappyDuckie]

Today would be day 4. The only one that looks like it is developing is #8. They are in order. #8 has what looks like veins.

None of them really look like they are developing to me, but it's only day 4 so I would leave them and candle again on day 7.
What kind of incubator are you using?