I bought my broody muscovy 11 hatching eggs but this morning there was another 12th egg there. Why would that be? She stopped laying about a week ago and started sitting on her unfertilized eggs and I swapped them all yesterday for fertilized ones. Why would there be an extra egg today? I thought she wouldn't lay any more till she hatched the babies? I have other ducks in the same Quack Shack but how would they lay in her nest when she never gets off it? Can anyone explain how this all works to me please?