Sorry shicks,  The eggs with bolld spots are just that, blood spots, not a sign of fertilization.  Also MOST eggs from the super market are NOT fertile. They are produced by egg farms where the poor chickens are fed a super feed to make them lay more, lights on 24 hours (sometimes, rarely, they turn off the lights for 2 or 3 hours. They are also in little cages probably 12" square, have  never even see a rooster or real sunlight and very few humans. They are on a floor of fencing material  so that their feces drop down to a conveyer belt and the eggs drop into another for processing.

If you get farm raised or organic eggs they MAY be fertile and are definitely much fresher.  I'm not sure of the time of freshness on the factory eggs but I believe that I read somewhere that the average age of the eggs at time of purchase is 2 or 3 months!

Sorry shicks,  The eggs with bolld spots are just that, blood spots, not a sign of fertilization.  Also MOST eggs from the super market are NOT fertile. They are produced by egg farms where the poor chickens are fed a super feed to make them lay more, lights on 24 hours (sometimes, rarely, they turn off the lights for 2 or 3 hours. They are also in little cages probably 12" square, have  never even see a rooster or real sunlight and very few humans. They are on a floor of fencing material  so that their feces drop down to a conveyer belt and the eggs drop into another for processing.

If you get farm raised or organic eggs they MAY be fertile and are definitely much fresher.  I'm not sure of the time of freshness on the factory eggs but I believe that I read somewhere that the average age of the eggs at time of purchase is 2 or 3 months!