Black spots in a (we think) dove egg...

Question
Ok so a couple of days ago(on easter) me and my step sister found a couple of eggs that had fallen out of a nest and were left. we believe They are dove eggs, we checked some pictures on the internet and our eggs looked like the dove eggs we saw on the internet... although im not sure if they are the same... Mines a whitish blue color and hers is a whiteish pink... anyways over this last week ive notice that the embreyo inside my egg is growing and about two days ago i began noticing little black dots that are forming inside the egg near the embreyo... Im not sure what it is and im beginging to wonder if its some form of bacteria and if it could hurt the egg and how i can help it if the spots are somehow harming the embreyo. Ive searched around and not found anything about this. Is there any help you can provide? I havent seen the other egg so im not sure if its just this one. But the embreyo seemed to be growing fine earlier this week and its still growing but so are the black spots....

Answer
Well, this is unusual. If you found the eggs, they probably did not fall out of a nest or they would have broken. They may have been laid on the ground. They may or may not be dove eggs. If you are not incubating the eggs, they should not be growing if they are bird eggs. It doesn't sound like you are incubating them. Let me ask you this first  before I go any further. Are the egg shells hard or are they a little soft like spongy or leathery?