They are probably Phorid fly, I have seen them get in eggs before. Do you use crickets, they often come in on the egg crate. I have not seen them get in the albumen. I would use Q-tips and keep them swabbed off as best you can. If they get bad, I would take the baby out of the egg, clean it, and put it in a deli cup on moist paper towels in a warm spot. I would also use an incubator next time. Good luck.
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