What is your incubator?
I have hova-bator still air with automatic egg turner.
I had 15 bantam eggs (due date 4/1) and 30 copper marans eggs (due date 4/4) together in there.
Last Monday, I set 14 bantam eggs, and when I did that, I just left auto egg turner inside the bator, and just removed 2 turning rails from it. So it made empty space for lockdown my bantam eggs.
Also dozen egg carton perfectly fit in there, so I did lockdown bantam eggs in egg carton, and my copper marans eggs are still turned by auto turner now. I will wait until tomorrow night to lockdown these marans eggs.
My bantams are pipping now, so I hope they all come out by tomorrow night, so I can lockdown marans eggs.