Congrats! I put my puppy on a martingale around 15 - 16 weeks I think and oh my it helped out a lot!
I hope it lasts a long time, maybe forever with you because my puppy one day decided that he didn't care about the corrections from the martingale anymore
He would still follow by my side with treats, but I don't want to have to hold a treat in front of his nose for every step of the way!
We are working with a prong now and it is fantastic.
Good luck to you!