That egg is ready. It's bulging the air sac. Your other eggs will do just fine if you lockdown now, are you laying them all flat? Or in cartons? If I were you, put the eggs - chickens and ducks - into cartons, pointy end down, and put a book under one end of the bator. Put the humidity up. Put the book under the other end tomorrow. It will stop the duck eggs moving too much, but keep a little movement for the chickens. They are for lockdown Friday, right? End of day 17?