I can tell about my country .. eggs we normally buy from large scale poultry farms are unfertilized (hens do not need a rooster to lay an egg; they do so almost daily on their own.)
Eggs that local farmers bring to the market (about 1.5 x price) are fertliized (but maybe unfertilized too and passed off as fertilized). You can tell fertilized chicken eggs apart from unfertilized ones by candling eggs (with cell phone flash or LED torch)
It is not unknown to buy a fertilized egg in morning and have a chick hatch out of it in afternoon and wander around the pantry .. (given right conditions of course)
This is an unfertilized egg
This is a fertilized egg
Google "candling eggs to tell if they are fertilized" (without quotes)