Hey I had 560cc Unders from a Negative A and I have stretch marks but they were from pregnancy, I have new ones as of yet (fingers crossed it will stay that way) You may get them or you may not, Only time will tell really, but after 6 weeks you can start using oils to help (although myself and I know others were using products before 6 weeks to try and help) 🙂 Happy Healing Babe and Congrats on your new additions xx