We had one egg cracked today and when I went to remove it, it sorta exploded. What a mess. Since we had the incubator open we candled the others even though its only day 4 or 5. I couldn't tell if what I saw was a blob of infection like some of the photos I've seen or a little bugger in there. Only two did I see spidering vein. The others just looked like dark shadows that floated along. Any ideas what I'm seeing?