My BR, Blueberry, seemed to be having a little trouble with her balance this morning, a slight limp, tail down and twitchy. She was eating and drinking fine and I followed her around until she pooped; that was fine too. Sometimes she would walk and run around like normal. Then she'd kind of lose her balance a little and sit down for a while. During the "normal" times her tail was up as usual. Then, when she'd sit it seemed like she was back heavy and her tail would go down; like she was uncomfortable and pushing it down. When she went in the roost box with the other 2 girls she stayed sitting in the bedding. She was eyeing the perch, like she wanted to go up there, but wasn't too sure about it. I lifted her on to the perch and she couldn't seem to balance. Again, it was like she was back/bottom heavy. I lifted her back down before she fell off the perch backwards. I did manage to get her on to a chair so I could check her over. No apparent injuries, her abdomen does not seem to be swollen and I can't feel anything that might be a stuck egg, but when I checked her vent it seemed to be pulsing a little. She's about 22 weeks old and has not laid any eggs yet, so I'm wondering if this could be signaling a first pullet egg - or if I need to start looking for another problem. She was sleeping in the nest box tonight when I went out to shut them in for the night. Any help/suggestions would be appreciated. Thanks.