It's fine! Go take a long walk outside! Go shopping. Ask a friend to meet you at the coffee Shoppe to chat. Go grocery shopping. Clean out your car. PlAy cards with your housemate. Just leave your eggs alone!
again, I don't know much about ducks but I do know that chickens will adopt chicks if they are given to them when they are one day old and snuck under the hen during the night so she wakes up with babies underneath her
I don't know about ducks, but I did have some chickens hatch 2 days late once. Also, if your temps were a little cool, your hatch could be delayed. Did you calibrate your thermometer?