I went to check on the eggs this morning to turn them, and one was chirping at me.
		
		
	 
You're supposed to stop turning on day 18 (for chicken eggs). And keep the bator closed until hatch. Day 18 should have been your last candling to determine if they were still viable or not..
The chirping means there was an internal pip.. and that may be the first one to hatch. It can take up to 24 hours for them to unzip once they have 
externally pipped. Due to variations in temperature (EVEN in forced air bators with possible exception to the ones that turn the same direction always in a circle) there can be a wide hatch frame window. Especially being a first time with barnyard cross eggs.. after hatching nearly 1000+ chicks.. I KNOW my breeding lines, AND my bator set up and parameters are dialed in.. I move my eggs to a new position in the bator every day or two to combat ANY temperature difference (square bators) and keep them from adding up over time preventing any early or late hatchers, keeping my hatch frame at under 12 hours.
But here on BYC, with so many adventurers, power outages, non calibrated equipment (or depending on built in sensors), etc.. I've seen hatch day be as late as day 24. and as early as day 18 for chicken chicks.. I personally unplug my bator on day 22, but realize that's NOT an appropriate suggestion for MOST of my fellow enthusiast.
I absolutely loathe the whole water candle thing.. I never do it and never recommend it. I do consider it a good way to contaminate eggs.
Highly recommend patience! 
You can't tell malpo from candling.. usually only once the chick's pipped the wrong end of the egg. Getting your incubation parameters right CAN impact this. (causes listed on page 53 of the link posted next)
My favorite hatch resource is quite technical and not much fun to read.. but still fascinating. Cause of specific incubation and hatch issues according to what day they happened or what symptom is seen start around page 51..
https://www.hubbardbreeders.com/media/incubation_guideen__053407700_1525_26062017.pdf
Happy hatching! 


