I am worried about one egg w/ a large pip hole (hole is big enough for it's head to fit through). It's been like that for over 24hrs and it is not zipping. It's breathing and I can see it moving, but it is just not coming out. I have had other chicks pip and zip in the amount of time it took it to pip it's large hole. I don't want to help it out if I don't have to. Should I be worried? What should I do?