Thanks for the pic. My new chicken knowledge for the dayWhen you crack that egg you will see a little dot, like a bull's eye on the yolk. It will be a little lighter gold in the center with a darker ring around it...about the size of a small BB in the early stages.
Here's a thread done by SpeckledHen, a great contributor on this forum, that shows a good series of pics on this : https://www.backyardchickens.com/t/16008/how-to-tell-a-fertile-vs-infertile-egg-pictures
This is one of the pics of a fertile egg:
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