My chicken just started doing this, about 20mins ago she was out in her pen when she started screeching as if something was giving her pain. She literally broke out of her coop, and ran up to the door. I let her in thinking an animal was attacking her but there was nothing out side. Once in she would jump as if she was in pain every so often, and when she wasn't doing that she looked on edge. Some one said they noticed something red coming out of her rear end, but when I looked nothing was there. Please help, I'm worried.