When we collected eggs today we found 4 olive green eggs in the coops(main coop & a small private one with a single box). Normally we only get 3, because we only have 3 Olive Egger Hens. One of the eggs has a lot of extra calcium build up on it so I am wondering if maybe she didn't lay her egg last night and then did this morning and laid another later in the day? Is that possible for her to "hold onto" an egg? I know it wasn't there yesterday.