I had the tablets with DS & DD #2 and took them from 32 weeks...I'm not sure if it did anything either but it sure didnt hurt...I had fast labours with only minutes of pushing (5 mins and 7 mins respectively).

DS was 1 hour 5 mins and DD #2 was 1 hour 27 mins \/

My understanding was that they help with second stage of labour...they dont help bring it on

HTH