I moisturised in the morning with Palmers cocoa butter and then at night with Bio Oil (because it smells better!). I didn't get any stretchmarks.... until week 32 when I woke up, looked in the mirror and had grown a gazillion of them overnight. I think if you're going to get them, you'll get them no matter what. I'm not as disappointed as I thought I would be at getting them.

One problem I do have, is now I have the stretchmarks, I'm having reactions to most creams/moisturisers/oils. Good old Olive Oil is relieving the itch a bit and not leaving any rash.