I had the same situation but 3 weeks ago and in CT it's been getting pretty cold. It's her first broody so I'm happy that 4 out of 7 eggs hatched. The probs was that there was one that started to hatch but the mom abandoned it for the chicks and it died. Fortunately I checked the two other eggs and they had some form of chick in it so ik that all of my eggs are fertilized. So happy!!!