I just candled eggs for the first time. They were put under the broody hens on Thursday night... so they are about 5 days old. I can see capillaries in a few of the eggs, but these ones just have... I dunno, dark areas, where over half the egg is completely opaque. Plus, some have spots. I am worried! The spot ones look like the one from here, https://www.backyardchickens.com/LC-candling.html that have bacterial contamination.
These 2 I'm not worried about:
Here are the incubators:




These 2 I'm not worried about:


Here are the incubators:

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