Last week, i think, I had four eggs in my bator. One started developing, but the other three didn't. So I waited until day 10 before i decided it was time to get them out. I cracked two open(which weren't fertile by the looks of it) and the other, very dark one. The dark one had some blood in it! It looked like it started to develop, but had died. But why was there some blood in it? Thanks!