I'm 39 weeks and I only started drinking it 2 days ago. (4 cups so far). Can't tell you if it brings on contractions as I haven't felt any. On the box it says it's supposed to help tone the uterus, and help with menstrual cramps so that you'll have an easier labor, not necessary to induce labor. But after drinking 3 cups yesterday, my mucus plug came out and I was pooping a lot. And those are the signs of going into labor soon.