I have two chicken eggs laid and set the same day.... Today is day 19. One egg looks like a day 18 or 19 embryo like on this link: http://www.eggincubator.biz/Embryonic-Development-Process.html The second looks like a day 17 (the one that looks like a V). The second always candles differently than the first. The obvious development took longer to see and the embryo seemed to hang out in the less visable center of the egg. Is it possible that the second could be behind the first and hatch later? Is hatch day determined by development of do they hatch despite development?