I am a second time egg hatcher. One of the chicks zippered, popped the top off, then started coming out butt first. It has had its hind end and wings are poking out of the egg for about 12 hours with no progress. It's head and feet are still in the egg. It has been moving quite a bit, but there has been no progress for about 12 hours. Should i give it some help? If not, at what point should I give it some help?