I'm new at raising backyard chickens. My first hen was given to me already laying. Her eggs are larger than extra large store bought eggs and yummy. I got 2 more pullets. From about 12 weeks, they were given broiler finisher feed by mistake. Now they are about 20 weeks. One of them just started laying. The other one will start anytime. I've switched to layer feed and supplementing with crushed oyster shells. Did I adversely affect my new layers by giving them broiler feed for a couple of months? What should I expect?