No, eggs do not come from chickens (or any other birds) butt. Check out "How a hen lays her egg" at ~poultry/ there's an awesome I never really thought about this before so I was just wondering. Picked up a couple from an established flock, both ~ 2 years old, First two days were fine, but this morning one of them is hiding in the coop, won't come out. When I was checking the coop for eggs, I saw that her butt is seeping blood. All of the above can cause bleeding like your hen has, you'll need to.