I have been incubating 4 eggs. I candled on Day 20 and all 4 eggs were still good. Day 21 was yesterday. As of last night, only one egg had pipped. I continued to watch all day today. 3 eggs have still not done anything. I am concerned about the egg with the pip. Throughout the day, the pip hole has gotten just slightly bigger. Earlier this evening, I noticed that the membrane was broken. Now the chick's beak is in the pip hole. Should I leave it alone? Should I grab the tweezers and zip the shell for it? I have never helped out a chick. I am just concerned that if the chick's beak is out of the pip hole then it will not be able to pull it back inside the egg to zip around. What should I do?