Just put them on lockdown and up the humidity and they will be ok I only set 3 eggs and they all hatched. They are 2 weeks old now and really healthy so I dont think the early hatch did them any harm. Good luck
I had 3 ducks hatch on day 23 their all fine 1 had pipped at the wrong end and had to be helped probably because I was still turning them. Another lady had the same thing not sure if it's something to do with the warmer weather?