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I can post more if needed but there are two lines at the bottom marking the air sac growth

I think it's an robin egg

So I recently started (3-2days) incubating an egg and the yolk didn't seem to move as much and the air cell enlarged a small amount from the marked space at the beginning of incubation, I don't see any veins however it's also not a chicken or quail egg. Please help me . I would be happy to post...