I have already had 3 eggs hatch and this fourth one has been like this since at least yesterday at 2pm. To me the crack in the shell looks different then the other eggs when they hatched. It's made no progress for over 24hrs I can see he/she is still breathing and I see it's beak. Saturday was the 28th day of incubation so Sunday will be the 29th I'm concerned about him/her. Since this is the first time hatching duck eggs I'm not sure what to do, I need some advice!!