Can Prenatal Mage Put You Into Labor (39 Weeks Tomorrow)?

I'll be 39 weeks tomorrow; I was 4 cm dilated and 90% effaced at my Thursday appointment and have been having some cramps in my back and lower abdomen (not full-fledged contractions, but maybe the start of them). My sister is giving me a free prenatal mage today. She is a trained and licensed mage therapist (for over 10 years now), but it will actually be my first mage from her, because she's usually so booked up and I prefer she be able to make money over giving me one for free. Anyway, I think I've heard that prenatal mage can send you into labor if you're on the brink. Just wondering if anyone has found that to be true. I don't mind if it does or does not, but I was curious.