Do I have fertile eggs?

I have read all over the web about determining if I have fertile eggs. All of the eggs being layed have a distinct bullseye mark on them. I can't seem to identify a rooster in my flock. 2 chickens, definitely hens are about 7 months old. 4 chickens just turned 5. All chicken breeds are different which limits my comparisons; however non are crowing. Any thoughts?
 

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