Hi I've had 4 healthy chicks hatch in this batch of eggs so far. I have one egg that has both and internal and external pip - the strange thing is that it hasn't cheeped at all. Could something be wrong with it? Why isn't it noisy? Will it mean it's a weak chick? I have 4 more eggs that need to hatch - hopefully, there are two solid looking ones in the hatching incubator that I don't think are viable. I'm a first time egg hatcher... Any advice or help is gratefully received Thank you.