Lol, yeah, I lost about 10 lbs from 176ish to 166.
Imagine my surprise when I started getting stretchmarks on my stomach during weight loss!
Oftentimes you can have gotten stretch marks that aren't noticeable while the skin is pulled tight from fat... and then when you lose that fat, you get the lovely purple-red line. Awesome.
I haven't found anything epic to get rid of them, but every one I've ever had has faded to the point that it's not that obvious, so I hope you don't stress about them TOO much!