Haven't gotten to the end but this is true. Many things can throw them off. This is why I recommend a calm demeanor when around your birds. It could take a week or more. Too, avoid all treats for a while. I realize that they are your "babies" but they are chickens first. Let them get used to you for some time before you pick them up. Don't try to force them to go outside. Let them decide for themselves.When I got Lucy it took her exactly two weeks to the day to lay an egg for us. I think it stresses them out. New environment and all...
Remember there are only two things chickens really need. Feed and clean water. If you are prone to treats, or things other than feed you can expect them to lay less than they would otherwise. If you are getting enough eggs then this will not be a problem. Also keep in mind that different breeds lay more or less than others, but definitely not an egg a day.
I wish you well,
Rancher