I put 6 runner duck eggs under my broody and then 5 chick eggs 7 days later. Supposedly they will all hatch on the 28th. What if I screwed up and some hatch and she leaves the nest early. It would be my fault and I would hate to compromise any of these babies. I have candled, I know we have some of each that are growing. Should I buy an incubator just in case. If she leaves the nest and I don't have one, I will never forgive myself. But I have no intention of incubating eggs otherwise, so it seems excessive.