My eggs are on day 56 and they are not dimpling yet? Do eggs always dimple before hatching? Temperature was running at 86-87 Friday and Saturday so I know that hatching date has been prolonged a few days, but it has since been corrected slowly, not overly concerned at the moment just more curious, how long do lower temperatures generally prolong the hatch date? When should I become concerned about the babies safety( ie not pipping)?