This is my first time to hatch chicks. Today is day 20 and I have one chick that pipped I think. He made the triangle in the shell but the membrane is still closed. I'm so worried that he can't get air. How long before he hatches? I am also worried about my other chicks. I should have maybe 3 or 4 other chicks to hatch. Are they OK? The shells looked completely dark when I candled them on day 19.