Stretch marks?

I am a FTM I’ve been self conscious about getting stretch marks I’m 7 months pregnant and none yet does this mean I’m just not getting any??? Or is the third trimester when the pop up? I’ve been big I’ve been small in my life I do have stretch marks on my hips but so far none on my belly . I was thinking maybe I won’t get them before I was pregnant I lost 50 lbs so maybe my skin is still elastic? Idk I am showing for sureeee