Stretch marks, second pregnancy..

Jené • 23 years old married, mommy to a beautiful daughter 12-22-13 and handsome son 9-8-15.💜💙
I'm 24 weeks with my second child but my first little boy, and I have stretch marks from my daughter a year an a half ago. I was wondering do new stretch marks appear the second pregnancy or do you just not get them because you have the old ones? Only wondered because I haven't really noticed any "new" stretch marks. Thanks in advance.