I am genetically predisposed to stretch marks got some in my teens on my bum and hips however I haven't got any on my tummy or anywhere else during this my first pregnancy. Have stayed well hydrated and used neals yard remedies mothers balm all over as its organic and I didn't want to slather chemicals all over my bump. It's certainly seems to have worked and I don't get any itching or red scarring.
I have stretch marks on my hips from growing up but so far (I'm 30+6 wks)have nothing on my stomach. My mum didn't get any, but then she has no stretch marks at all! I've been using the Bloom and Blossom bath oil. Not sure if it's helping but my skin does feel incredibly moisturised. Not dry or stretchy at all!