Stretch marks with 2nd pregnancy

This might be a dumb question, but if you got stretch marks with your first pregnancy, do those same stretch marks come back/darken again with subsequent pregnancies, or do more appear, or both? I'm on my second pregnancy (18 weeks) and I only have just a few on my hips from my first pregnancy and that's it (I got lucky), and I'm hoping I don't get more, but I'm not sure how stretch marks work.