my egg is cheeping.....!!!!

...but no sign of pipping. Should I be worried? The 21 days is up on Sunday - this is the first incy hatch I've done so I don't know if I should be helping/ignoring/? I've put a little bowl of water in for the humidity, but have mo way to measure the humidity so should I add another bowl? (the incy was a panic solution this morning when my broody hens decided not to be broody any more and I found cold eggs first thing! I've candled them and can see movement and heard the ldest one cheep)
All advice gratefully received!

Sit on your hands!  Leave the eggs well alone.  They have aaaaaaages to go yet if they are not due til Sunday (I know as I have an incubator full due on Sunday)!