I have 4 hens. 2 of which are ready. I've checked their pelvis placement and their vents are "open" and they've been squating for a little over 2 weeks. 3 of them are 20-21 weeks and 1 was given to me and she is 28-30 weeks. The guy who gave her to me said she's laid a few eggs for him but I've had her a week now and nothing Am I doing something wrong? They get purina laying crumble with a little extra oyster shells. They have boxes with woods shaving(not hard). They get plenty of water I even put ice in their water bucket if it's over 85°. They have plenty of shade. They get a little block of mill worms once a week..... Any advice?