stretch marks!!!

I use vitamin E oil twice daily on my chest and belly. I have marks on my chest already but at almost 29 weeks pregnant I have been able to save my belly for the most part until now. I'm starting to get them on my stomach and am looking for any advice to fade the ones I have and to prevent getting any further marks. I drink lots of water and try to eat healthy. I have the best intentions to work out but exhaustion gets the best of me. I walk when I can. Any advice of what to do about stretch marks?