If you're having a C-section, Mommies, do you wait for labor pains or …

If you're having a C-section, Mommies, do you wait for labor pains or book with the gynecologist? And if it happens that you go into labor before your scheduled date, do they just let you have a normal birth or do they still perform a C-section? I'm 34 weeks due for a C-section in August, but due to complications, I might do it in mid-July.