I am new to raising chickens and am very anxious for my first eggs. My RIR are now 21 weeks and none of them have laid. I have 25 of them so I thought at least one would have started already. I have read on here that some started at 17 weeks. I was told by a worker at the feed store to start them on lay pellets when they finished a couple sacks of grower but on here I read to keep them on grower until they begin to lay. Should I switch back to grower or is it too late, and did I do any harm since I started the pellets early?