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You're welcome! I found it by going to Search an typing in the search box, "how to tell if an egg is fertilized" and I found "The Official Egg Thread" by Colored Egg Farmer. It's got lots of other links for other egg topics.
You'll really learn a lot on here!
As to telling if eggs are fertilized:
How old is your roo?
This thread might help determine fertilization https://www.backyardchickens.com/forum/viewtopic.php?id=16008
And by the way, keep that last Barred Rock safe! They are precious!!
Good luck and best...