Our broody barred cochin NEEDED to be a mom, so we jumped on down to Trader Joes to get her some fertile eggs. She has been sitting on them for about a week now and I have a few questions as a newbie. 1) We have been candling them every night and see no change. When should we start raising our eyebrow that maybe these eggs are duds? 2) If the eggs are duds, will she know this and discard them or continue to sit on them FOREVER? lol 3) Whilst candling, we could see cracks in one egg. We placed it back for now and it hasn't broken, but I assume we throw it out. Am I incorrect? Thanks in advance everyone. The egg pictures were taken at day 3, but I assume they have some days on them from fertilization time to fridge no?