If you're very worried about it sticking you can increase the humidity and/or dab water on it with a cloth or something.
Weirdly enough, for years I'd been following the instructions given with incubators and ending up with a bunch of dead chicks.. Then I tried no water in the incubator until the end, and then a little water, and my chicks are mostly fine. Hatching eggs seems to be a lot of trial and error, and different things seem to work for different people.
If your chicks go more than  a day to three days without hatching you will probably have to help them out, especially for the later days or if they seem stuck or more distressed than they should be.