Mommies if you are to have a c section do you wait for labor pains or …

Mommies if you are to have a c section do you wait for labor pains or you just book with the gynecologist. And if it happens that you go into labor before your booked date do they just let you have normal birth or they still perform c section? I'm 34 weeks due for c section on August but due to complications I might do it mid July