it doesn't put you into labor it gets your body ready for labor. it works like squats to push your baby into your pelvis more.
I did for 4 out of the 5 days I was in labor & nothing progressed . I honestly think the ball is just to make you comfortable but women are different my mom recommends it & she's a nicu dr
I've seen someone go into labor on one...lol scary! But worth looking into. People recommend them a lot.