I was a size 12 before pregnancy, I'm 22 weeks now and my tummy is hard but still a little squishy. It wasn't super hard until like 2 weeks ago, I would assume it was different for everyone though. I wasn't even showing until about 3 weeks ago and I know girls who are like 15 weeks and much bigger than me with rock hard bellies
Takes time im 8months just now getting hard. The baby growing is whats going to stretch your tummy out and make it hard.
Stretch marks are normal. I didn't start showing til I was 6 months but by then I was huge. I was also plus size
Around 21 weeks. And after im 25 Weeks mines pretty. Damn. Hard lol