Yay! Welcome to the addicting club lol
Candle them between 7-10 days ans again before lock down. Most likely not all 12 will make it to lockdown. Doesn’t mean you did anything wrong or the chickens it’s just the way it goes. But even if they do all make it 12 will be ok. They will be all snug in there. I have moved eggs around to free up incubators and have had 12 hatch in there. It looks a little iffy but they all did fine.
Candle them between 7-10 days ans again before lock down. Most likely not all 12 will make it to lockdown. Doesn’t mean you did anything wrong or the chickens it’s just the way it goes. But even if they do all make it 12 will be ok. They will be all snug in there. I have moved eggs around to free up incubators and have had 12 hatch in there. It looks a little iffy but they all did fine.