First time crochet help

Can I ask what stitch you were doing? It kind of looks like maybe single crochet worked into the third loop (loop at the back, behind the actual "V" part of the stitch) but I'm not totally sure. And then maybe that one row you were referring to was worked in the back loop? Was there a pattern you were following?

This link here shows the looks of working into the different loops: https://pattern-paradise.com/2020/09/26/tutorial-working-in-front-back-or-third-loop/

##Please link to the pattern, if it is a paid pattern please post a screenshot of the few rows you are having trouble with, if a video then please provide the timestamp of the part of the video that you need help with. Help us help you!

#####While you’re waiting for replies, check out this wiki page which will take you from picking up your first hook, to completion of your first project. Lefties are included! Lots of useful information such as links to UK/US stitches, a beginners equipment list, the different ways to crochet an item, and a list of beginner friendly projects.

#####If you’re learning amigurumi, there’s a dedicated beginner section here, the Woobles course is very thorough for those just starting out.

#####You will also find heaps of useful beginner resources here including beginner tips, sub discussions and common mistakes. Check the subject list at the top of the page.
 

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To me: it looks like you just did that row a little looser tension than the others.