so the 5 eggs are in the hovabator? Then definitely use maybe a couple of large bottles of warm water to help maintain temperature and make sure the water temperature is as close to 100F when you put it in otherwise it will draw heat away.
How many eggs do you have in the incubator? I find that with mine Hovabator, if I have only a few eggs, I put a large bottle of water to serve as heat reserve and that helps a lot and have the incubator in a room where the temp is quite constant as it can't cope with external temp flux very...