Ok,so now iknow you can see if the egg fertilised.thz, but can...?

leave the eggs under the hen!! and don't put them in water to see if they will float. When you leave the egg in the nest once she has a few eggs she will start to "set". Once she is setting, leave her alone. Make sure she has food and water available, but don't be worried if she doesn't eat. Once she sets, it will take 19 to 23 days for the chicks to hatch. 21 days is normal, but it depends on the temperature where she is setting too and the time of year.