My first female this year went 43 days and the clutch I found this morning was day 34... It varies female to Female and if you are checking on her more than normal that can agitate her and cause her to retain her eggs longer than she normally would have. It's not like the eggs will melt if they aren't immediately put in the incubator, Lol.

Take a deep breath relax and when you find them it'll be an awesome surprise!!!
I know cause my baby girl just laid yesterday morning!!!