Yes. BUT.... the chances of both embryos surviving to hatch is very very low and in the few cases it has happened assisting has been necessary. Unlike mammals, an egg is limited by it's nutrients and space making it unlikely to provide for 2 embryos. Many find it unethical to knowingly incubate...
Candling is a personal preference. Days 7/14/18 is the norm and also the best to check air cell size especially for new hatchers who haven't figured out the humidity game yet. http://letsraisechickens.weebly.com/blog/throw-away-those-incubator-manuals-understanding-and-controlling-humidity
What I was going to reply is what feedman wrote...lol
This
If you know the issues and compensate for them you can have good hatches, just a lot more work to get it.
I did once. Last year. Day 16 or 17. Cracked up the backside of the egg. Put scotch tape on it. That bugger pipped and zipped by itself with no problem.
There is no way to guarantee the eggs will hatch. People will say do this or don't do that, but it comes down to whether the chicks are viable and strong enough. It depends on whether your temps were correct and if the average humidity during incubation allowed for proper moisture loss.
The...
She does NOT look amused...lol
I have to use desktop for anything pic related too. The app won't let me and my iPad is always telling me it's outdated and will slow me down...lol
I wouldn't mind, some day, hatching some Royal Palms. First turkeys I ever found attractive.
The not knowing how long makes it believable, you caught it before the internal temp went too high. Now if you said they'd been at that temp for an hour.... I would have a hard time with it...lol Congrats!
Most people prefer setting eggs a week or less old, the most quoted recommendation is 10 days or less, but it's agreed pretty much after 2 weeks viability significantly decreases. But your collecting them so they are not being incubated until set.
If you collect the number you want, (collecting eggs for less than 2 weeks is best) storing them as mentioned and setting them all at once will put the hatch day all on the same day, (generally hatchers all hatch out within 24-48 hours). Hatch day has nothing to do with when they were laid, but...