I collect eggs every day. I noticed different behavior from the Rouen. She made a nest and was sitting in it longer and longer every day. She did that for days. Then she stopped laying eggs. I waited a day or two and then gave her 4 eggs in her nest. She took to them right away. I did not expect the ducks to go broody so it was a nice surprise to see her behaviors take shape. I waited until I thought she was ready before attempting to give her eggs. This was my first broody so I wasn't sure what to expect.I wonder how much longer until our girl(s) decide its time to sit.
Good luck with your girls!