Hi! This is Jenn's daughter! 11 days ago, we bought 7 Rhodebar hatching eggs and placed them under our broody BO. Today, day 11, I candled them. Only 3 were developing; they were mostly dark with veins and air sacks. The other 4 were clear, with only air sacks. Should it be evident by now if they are fertile or not? And when should we remove them by to prevent explosions? Thanks!