What are these dark green spots inside raw eggs? I bought a tray of eggs recently. They aren't old, I have them in the fridge, and the date stamped on the egg says they are good for another month.

In two eggs that I cracked open today, there were dark green spots inside the shell (looked like mold maybe?), and floating around the egg white. 

Any idea what that is? Is it a sign that the whole tray may be contaminated with something??

I only noticed the green on the shell after I mixed one of the eggs into a bread dough, and now I need to know if I should throw the dough out or not (it's a huge batch of dough).
According to http://www.eggsafety.org/consumers/consumer-faqs, black or green spots inside the egg are the result of bacterial or fungal contamination of the egg.

The use by date is only an estimate, so if your eggs are moldy, I'd bin them.