One of my RIR hens had been playing broody for quite a while, but was never fully committed. She had been sitting on a bunch of fake eggs. Then she became committed. I literally grabbed some eggs out of the fridge and put them under her and removed the fake eggs. I candled the eggs and it seems 5 out of the 6 are viable. One question I have is it was probably 3 days after she was fully committed that I did the switch. Is there a risk she may quit 3 days before they are to hatch?