I didn't know my gardeners sprayed our backyard with weed killer. We let the chickens free range in th same area a few days later. We have been getting small eggs from two of our girls. Is this a sign of being poisoned? I don't know what to do and I feel terrible. It's been a week since they sprayed the weeds and about 4 days since they have free ranged in that area. Would I see other symptoms by now? Thank you.