Bio oil

Cindy💕 • 18, mummy to George 31/07/16👶🏻💙 fiancée of a amazing man 5th Jan '16💕
So after the birth of my son just over 3 weeks ago ive been left with terrible stretch marks, and although they're not bothering me too bad my mum bought me some bio oil, any of you ladies had any experience with this working before? If so how long before I should expect to see any change?