My 22 week old NHR started laying eggs last Friday. She laid 3 days in a row and now the last 2 days, no eggs. I watched her today and she went up to the nesting box at least 3 times. Each time I checked and no egg. Is this common for young chickens? I also have a 22 week old White Leghorn that has been laying for 3 weeks now and she only missed 2 days. Thanks for any input.