How did you prevent stretch marks during pregnancy?

Dreaming • Mumma bear to baby boy 🧸 and expecting again 🤰🏼 💕 Dreaming always dreaming 💕
I really don't want to get stretch marks, I'm using coconut oil for now, I hear castor oil is good. What did you do to stop any stretch marks from appearing? 
I have a few stretch marks from losing weight and I really don't want anymore.