Normal looking scar?

Renee • Mommy to two girls, Naomi and Raven who are 11 years apart.
I'm a little worried they didn't stitch me back properly. Above my scar it seems to puff out and on the right side I still have a knotted string poking out. I'm almost 4 weeks pp. does this look normal? Care to post a pic of your c section scar?