stretch marks

I don't have them yet, but my belly and my skin in general is extremely itchy and dry the past few days. I know that my belly is stretching, but my legs shouldn't be. I started to do some research on this...and to see what products work best for stretch marks...and dry skin during pregnancy and all i did was get more confused. Anyone have any good tips/products they've used during pregnancy to stop the itching, avoid stretch marks. All the research i've done says that stretch marks are hereditary....does anyone have any advice? I could really use it...since this is all very new to my body and I.