Belly does not look that big. 26 weeks

Im 26 weeks today. And my belly does not look that big as per the weeks. I feel its not growing so much as i see others. Im getting worried thinking baby growth is ok or not.

I had an ultrasound at 24 weeks. Growth was normal. But i have a cord issue so thats making me paranoid.i tried to measure fundal height myself but it was coming out to be short. Im not even sure if i was measuring correctly. This is my first baby.

Is there anyone whose belly does not grow much or looks that big as per the weeks and everything turned out fine?