Worked both times for me. I went into labor 2 hours later with my son and 12 hours later with my daughter.

I started having contraction/lost my mucus plug that same day my water broke two days later..

Mine made me contract the same day, then my water broke the next day and had a 7 hour labor but I had her on my due date

I had 3 the 3rd one did the trick kinda

I went into labor the next day but I was 40 weeks and 1 day