I'm surprised in that article that it says if you've had a previous c-section then you shouldn't take it.

I took it for my 3rd and 4th pregnancy (so for my VBA2C and VBA2C2) - from around 34 weeks. If I got really painful BH's then I would drop the amount I was consuming, usually I would have around 3 cups of tea a day.

My labours were 13 hours (4 hours active) and 7 hours (2.5 hours active)