how to prevent stretch marks ?!

Ky
I'm 20, skinny & 6 weeks pregnant. Is there anything you swear by that prevented you from getting stretch marks?? I will do anything to prevent them, what creams/ oils did/do you use? My mom had me at 19 and has a ton. Thank you :)
Edit:......ok I realize I can't completely prevent them I was just looking for some suggestions to help at least....