I used cocoa butter to help but 8 days before my due date I got stretch marks on my lower belly. I was upset but then I just thought I should just be proud of them(:
I used coconut oil recommended by my doctor and it worked amazing a barley had any stretch marks. I hate that is an oil but it really works and it's cheap
Sometimes no matter how hard you try to prevent them, they can still happen. I started to get a couple on my lower abdomen and hips by week 33. I am currently 36 weeks and 1 day. I had been and have continued to apply cocoa butter products but I am still getting some. They're not awful, thank goodness
Another factor and probably the biggest one is that it all comes down to genetics. Also, steady weight gain helps to slow down the progress of them. Good luck! :)
Coco butter strechmark is what its called and it has helped me I have not got a stretchmark yet and im 29 weeks and my hips so seen them coming and there going away now and my thighs .. good luck