My chicken eggs are on day 24 today. I know that late hatch can be a result of too low a temperature (which has been a struggle with my Little Giant incubator). One hatched yesterday morning, and another one hatched just now. They each had a pip the day before they hatched. I needed to slightly assist the second one last night because of how dry the membrane was but let him/her break out of the rest of it on her own this morning. The others have no pips but I am concerned that their membranes are dry as well? I don't hear scraping when I hold them up to my ear. Should I peel back a little bit of shell where the air pocket is marked?