Fertile eggs?

[chelswaterman]

Hey y'all,
I'm sorta kinda new at all the chicken stuff I have 20 chickens 18 hens n 2 roosters I've raised up from chicks n they started laying a few weeks ago. How long does it take for their eggs to become fertile? N how can I tell ?

 

[sunny & the 5 egg layers]

Here is a good thread (with pictures) on how to tell a fertile egg vs infertile egg: https://www.backyardchickens.com/t/16008/how-to-tell-a-fertile-vs-infertile-egg-pictures

Welcome to BYC, by the way!