Have you considered getting a second duckling from somewhere (Tractor Supply has chicks and ducks right now) once this one hatches? Lone chicks/ducks want a lot of attention. They don't like being alone and will peep a lot. I carried my lone duckling around with me for the first week until I got ahold of other ducks for him. Carried a lone chick around for two weeks until other eggs hatched. I tried the mirror trick, but I still thought they peeped a lot. Just something to think about while you wait for your little one to hatch.