I have one egg that's going to hatch late, either on day 22, or 23, possibly later. The egg is at day 21 right now, & nothing. Have any ideas if that's normal? The chick is alive inside the egg, I made sure of that. I also have one eggs at day 19, & it's air cell is small like at day 12, or 13-14ish. Would like to know if there's something wrong, please?