PlymouthRocky504
Chirping
Just went to check my BO as she’s expecting chicks next week after sitting on them for two weeks, and unfortunately found one of the 4 eggs which all are growing inside cracked and a dead chick inside 
don’t know how it happened or if when moving the eggs she accidentally stood on one and cracked it, luckily the other 3 eggs are still all good but very sad to loose one when seeing the chick already formed inside,
should I do anything to prevent it again or is this just an unlucky thing that can happen when hen is hatching chicks?

don’t know how it happened or if when moving the eggs she accidentally stood on one and cracked it, luckily the other 3 eggs are still all good but very sad to loose one when seeing the chick already formed inside,
should I do anything to prevent it again or is this just an unlucky thing that can happen when hen is hatching chicks?