To those further along in their pregnancy/ or PP cocoa er?

I have been rubbing a lotion with cocoa er on my belly every day. I am only in my first tri-mester, but I am trying to prepare my body. Did any of you guys use cocoa er against stretch marks and does it actually work? I have some old ones on my belly from when I gained weight in college, but you can't see them now and I really don't want them to reappear, or to get new ones.