If "no" is working, it's entirely up to you if you change it to "leave it". I'd recommend it because we use no in so many situations in every day life, you could confuse the pup but 10 weeks old and backing off like that is pretty good. Responding to verbal corrections is a great thing.
Shasta GSD 5/5/10 CGC, ITD, TC
"Dax" Thor z vom Weberhaus BCAT CAX2 CGCA ETD HCT NCO-1 PKD-T RATI RATN RA TC TKA 3/18/2013
"Hades" Guilty vom Blutfeuer 10/26/2018
Zena GSD 6/1/03-2/16/2016
Riley GSD/BC 1/10/05-2/1/2013