I have 4 hens (3 Buff orpingtons and 1 Barred Rock) and they are 20 weeks old. 4 days back I noticed one of them making the egg song and found two eggs on the nest box. I assumed they are going to start laying from that point on, but its been 4 days and they haven't laid any egg. Is is normal for chickens to take a break after their first egg or the weather or lack of day light has to do anything? I live in Maryland and it got to 50 deg this week. We still have 13 hours of sun light. Thank you.