It was odd. All 4 were walking around and acting like chickens should, all 4 layed an egg today, all before noon. Tonight around 7 I went out to change water and all were fine then all of a sudden one just kind of stopped moving around and her tail is up and her butt is pulsing. How can she be eggbound if she layed an egg today? Can it be anything else? She is about 20 weeks and everything else seems normal.