I have 5 eggs in a homemade incubator. The incubator is heated by a light bulb and it has a fan in it. They are due to hatch in about 5 days. This morning I woke up and the thermostat read 73.4 deg!!!!! The light bulb had burned out. I put in a new one and its up to temp now. Do you think they are still ok? I have candled them a couple times and they have been growing good so far . I would hate to loose them the last few days of incubation.