Oils to help prevent stretch marks

Denison
Can anyone speak from experience about oils or lotions they have used during their pregnancy to help prevent stretch marks? I am expecting again after having lost my first child a few months ago at 7 weeks. Now I am 4 weeks and 1 day along . Hopefully this time Sticks! How early did you begin applying oil / lotion? Where to... all to your stomach and hips? How many times a day? Thanks for your help!