I used it throughout both pregnancies. Just put a bit on after morning shower. I used about three bottles throughout pregnancy (obviously needed more as bump got bigger). And I continued using it til it ran out after the births. And I don't have one stretch mark. But friends have used it and have got stretch marks so I wonder if some people are just more prone to them. HTH
I highly recommend Decleor Sculpt oil for pregnancy which is fabulous and everyone I bought it for had no stretch marks so with my first pregnncny had to use!!
So far fabulous and really maintains elasticity in skin and smells divine in the evening, helps me sleep. Actually worth knowing all Decleor products are safe to use in pregnancy despite being 100% aromatheraphy! Except any seaweed based bath soaks!!