I used normal Palmer's cocoa butter when I was pregnant, but I totally recommend Bio Oil! (still love using it now even thought my marks are barely visible anymore)
You can get at Watson's: http://bit.ly/2fBvoCc
When I was pregnant, my stretch marks were reddish/ purplish? And I only focus on the parts I thought were obvious or were showing (eg: front of my belly and not sides)
This is not advisable cos any skin that experiencing stretching, when bouncing back, will show stretch marks. So rub oil on any part that stretches.
Other tips: https://sg.theasianparent.com/get-rid-of-stretch-marks-in-six-simple-steps/