Has anyone ever ended up going into labor on their own before their planned c-section date?

Fautima

I'm having a repeat c-section at 39 weeks but for some reason I have this nagging feeling that I'm gonna go into labor before then. I'm not really sure how to explain it. For those of you who ended up going into labor on your own did you end up delivering vaginally or did you still have a c-section?