Rocking Eggs on Day 14

[servant_of_fluffs]

17 standard chicken eggs went into a NR360 incubator on the 18th of March. Is it normal for one of them to be rocking back and forth already?! I could have sworn I heard the tiniest chirp but I probably imagined it... The last time I candled recently the egg was hard to see through and it looked like blackness . I can stop turning them if I have to. I was going to start turning the eggies manually tomorrow anyways since there is a delayed hatch. The eggy really likes when I whistle to it