Hi,
I just wanted to comment on your post since I was, until yesterday, still waiting on my first egg. My Buff is 29 weeks and I was convinced that she'd NEVER lay. Here is the sequence of behaviors that I noticed in the few weeks leading up to her first egg. Her comb and waddle turned really red several weeks ago, so I started watching her closely. Two weeks ago, she began to be more open to me touching her and she seemed to be more curious about what I was doing when I'd enter the coop. Then last week, I noticed that she was moving hay around and making random nests all over the coop. She was doing this in the nesting boxes and also in the hay on the floor...as if she was looking for her favorite spot. She also started getting a little more vocal. I could hear her in the mornings singing a little. This past Sunday, I walked into the coop and she began squatting. You will know when they squat because it is such an obvious pose. She will puff her wings out, flatten her back, and move her tail over and just sit there and let you pet her as long as you want to. There's no mistaking it. So, for me, it was four days after she began squatting. Waiting is TERRIBLE but when that first egg arrives, it is like Christmas morning! Hope this helps!!