Alot of times, creams don't help.
I have found this out many times with many women but to help REDUCE them if you rub vitamin E oil on your belly, daily along with cocoa butter it's proven to reduce them, but nothing will fully get rid of them if you get them.
If your mom and grandma have them, chances are you will have them, and it all depends on how big your baby will get, and how fast you pop out. just make sure to keep your belly well hydrated, that was it'll stretch easier then if you have a dry non-mouistured belly.