Do chickens start squatting before or after their first egg?? Thanks in advance!

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Thanks, and hens normally lay around 5-6 months correct and depending on their breed.
I currently have three that will squat for me and I got my first egg yesterday. One of my buffs has been squatting for about 2 weeks? now I think. I have two buffs and one brahma doing it. I go out and stick my hand over or on their back to check.