Around 21 weeks. And after im 25 Weeks mines pretty. Damn. Hard lol
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
Takes time im 8months just now getting hard. The baby growing is whats going to stretch your tummy out and make it hard.
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