x2It would be hard to see the development after only one day of sitting. Even with white eggshells it is hard to see day 3 development. When you candle you can see a spot and spidery veins going outward by day 3. And sometimes a hen will stay on her egg after laying it, but I don't count that as broody. We still eat those eggs. She has to stop laying eggs and stay on the nest at night for three nights before I consider her broody.