My domesticated Muscovy who was dumped in the canal in front of our home when she started to fly has nested. Her last egg was on November 7th. She had 21 eggs and since has kicked 9 eggs out of the nest. I know they are supposed to hatch in 35 days but she is still sitting on the 12 that are left and a few of them look like they have developed ducklings in them. How long should we wait before we remove the eggs and the nest?