My Barred Rock girls are 17 weeks old, eating 17% layer crumbles but no oyster shell because I thought they are still too young and wouldn't lay until about Christmas. Anyway, last night, I thought one had diarrhea but it was more yellow than most online pics. When I went back a bit later, there was a small soft shelled egg - intact but with a small opening and still containing liquid. This all happened in the dark when all were roosting. She acted okay after but was doing some extra preening. I want to try avoid egg related health issues if possible. Any thoughts?