Ok... stretch marks ... labor ... need some advice !

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This is my third baby, my stomach is already the size that it would be at like 22/24 weeks or so and I’m only 19 weeks. I’ve only gained 3lbs since the beginning. I never had any stretch marks with my other two girls. Any moms get stretch marks with subsequent pregnancies that never had them before ? Also third pregnancy how fast were your labor and deliveries? My first was 24hrs & 3 hrs of pushing, second was 12hrs and 15 minutes of pushing.

This is 18 weeks (left) and 19 weeks (right)