You normally won't see anything at day 4, but at day 6 you may be able to see some change if you know what you are looking for. Usually by day 8 it's pretty obvious if you have developing eggs. Some wait until day 10 or 14 to candle tho, when there is no need to guess.
I have a few pics of eggs that I took this past hatching season that might help you... but they are in automatic egg turners and they are collected eggs from my flocks, not shipped eggs. I am using a really bright C4 LED flashlight, since the shells are so thick and hard to see thru. If your eggs are laying on their sides you may not see the yolk settled at the bottom like in my pics.
Clear/infertile, no development.

Day 8, noticeable color change and faint veining.

Egg that was in a different incubator on the 6th day, clear/infertile.

6th day, fertile/developing egg, with noticeable color change.

8th day, developing egg with more visible veins and distinct color change.

Another developing egg on the 8th day.

I have a few pics of eggs that I took this past hatching season that might help you... but they are in automatic egg turners and they are collected eggs from my flocks, not shipped eggs. I am using a really bright C4 LED flashlight, since the shells are so thick and hard to see thru. If your eggs are laying on their sides you may not see the yolk settled at the bottom like in my pics.
Clear/infertile, no development.
Day 8, noticeable color change and faint veining.
Egg that was in a different incubator on the 6th day, clear/infertile.
6th day, fertile/developing egg, with noticeable color change.
8th day, developing egg with more visible veins and distinct color change.
Another developing egg on the 8th day.
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