Is it actually true that they are kind of genetic?!
Mum never had any stretch marks with me, so I might not get them in that case!!
I've been using Bio-Oil from about 12 weeks pregnant, started a little bump when I was about 10-11 weeks... Haven't used it religiously, as I have tremendous baby brain! However, so far I have no stretch marks at all, only two TINY ones on my left boob. But from my boos being so massive anyway when growing up I have white ones on them anyway so it's all gravy!
I've found it very helpful even if the creams/oils don't aid with stretch marks, as my tummy was getting SO SO itchy with the stretching, and the oil seemed to sooth it alot!!