Hi Have a hen who had 6 fertile eggs put under her all different breeds .. we lost two s they cracked in the nest in week 1 their is 4 left one which hatched day 20 and another hatched but didn`t make it found it squashed under her day 21 ..... to day she is still moving the 2 remaining eggs around and took them closer to the food and water and was showing her new chick what to do but still sitting on the eggs ..... no sign of cracks in them .. feel heavy to pick up .... how long do we wait ??? and if they don`t hatch do we remove them and when will it stress her out to take them away ???