Stretch mark preventions?

Hi ☺️

I’m 18 weeks pregnant with my first baby and just started to get a little bump. I was given some lush products for Christmas and one of the things in there was the Therapy Massage Bar which is apparently made for pregnancy and is good for preventing stretch marks! I love it but it’s like £7 a bar and doesn’t last very long! I know they are genetic, my mum doesn’t have any at all from having 4 babies, but I have barely noticeable little silver ones on my thighs from puberty, so I’m thinking I may get them. Has anyone tried any oils/creams that you feel have worked in preventing stretch marks during pregnancy? Not bothered about cost etc, I’ve also heard of something called Secret Saviours, but quite sceptical - has anyone had this before and felt like it impacted?

Thank you 😘