My female silkie chicken has been sitting on fertilized sebright eggs, because we do not have a rooster. On day 21, two of the eggs hatched. It is now day 23 and the last five eggs have not shown any sign of cracking and we have not heard any pips or chirps from the eggs. We have carefully checked under a flashlight to see if anything was in them, and the egg is completely dark, so there is a chick in there. We don't know how much longer we should wait before taking the eggs away. Should we take action, or should we just wait it out?