I'm 24 weeks with 3 kids n expecting my 4th n still hadn't noticed any new stretch marks thus far. I…

I'm 24 weeks with 3 kids n expecting my 4th n still hadn't noticed any new stretch marks thus far. I think the first 3 gave belly a good workout lol. My norm is my body lose weight during pregnancy n baby grow like crazy. The average weight of all my babies at birth is 5lbs n a few ounces. So I don't think I should see too many new stretch marks.