My female duck she is 3 years old, in mid july or end of july made a nest. She has 5 or more in it. The nest is made of hay. We noticed that she sits on it at night,and lightly covers the top during the day. But uncovers it at night to sit on them. Just recently the past week she sits right at the entrance of the coop during the day. The nest is right in the coop there. Does anyone think they could be fertile and its getting close to hatching? Could they be good fertile eggs?