so my 3 pullets are almost 11 months old. They have been averaging 2-3 eggs a day for many months now. The past two days I only got 2 eggs not really sure which one of the 2 was not giving me an egg though, (1 always gives me the “calcium” egg so I knew it wasn’t her.). And today, no one gave me an egg. Am I spoiled? No mites, they eat good, they drink good, they are dust bathing good. What gives?
are you providing an supplement for calcium? What do they eat? Breed? Sometimes they can just get "off" or be a late layer. They could also be eating soft shell ones without you noticing. I wouldnt worry too much about it but I know when I first started I was worried about EVERYTHING 
