My 5 girls were hatched mid June. They've been laying really well for the past month and a half. I would normally get 5 eggs a day, with some days only 2 or 3, but most days 5 eggs. For the past 5 days, I've been getting 2 to 4 eggs each day and today this was in the nesting box. It's like a perfect egg but teeny tiny, maybe the size of a nickle. I haven't tried breaking it open as I am extremely worried. There are 3 other normal eggs in the nest. No changes other than adding cut ready to eat alfalfa to their run.