I checked my eggs last night before bed. I noticed probably 5 or 6 eggs had little cracks in them that must be from the little birds trying to peck their way out. I checked again in the middle of the night and now this morning. The progress on them is very slow. Some appear to have made no progress since last night. Is this normal or is this a bad sign? It's only day 20 but I had two hatch yesterday so I'm getting some early arrivals.