Today is day 22 for my chicks. I have a total of 7 that made it to lockdown. They were shipped eggs, and had wonky air cells. At this point, 6 have hatched and are doing great. The last egg has not pipped. When I was getting the incubator set up for lock down, I heard this chick chirping from inside the egg, so I KNOW it developed to that point. I was getting impatient, so I tried to float test it today, and it sunk, which supposedly means it never developed. I know that's not true. Should I give it more time, or intervene?