I have a couple different breeds 4 polish, 1 welsummer, 1 barred rock, 1 speckled sussex, and 1 chocolate orpington. I don't think any of my chickens are laying yet. I've heard Polish aren't good layers, but I expected at least my barred rock or sussex to lay by now. The chickens all seem to be eating and drinking well and acting normal. They are kept in a coop/run and I usually let them out for a few hours every day. The last two days I keep them in to make sure they weren't laying else where, but nothing. I switched them over to 16% layer feed a couple week ago. Should I be concerned?