Welcome to YT! And congratulations with your little darling
It doesn't have to be an intentional scam! My no. 2 yorkie had a 6pound mother and a 1,5pound father. We expected her to be 4,8pounds, but she is now 6 months and weighs 2,8pounds and I am afraid she won't grow anymore. The breeder tells us that her sister is now close to 4pounds.
You just can't tell!
I weighed her at 13 weeks and she was 2,4pounds, so I figured she would grow to be 4,8...but nooooo, no....*sigh*
We love her anyway of course! And I am sick with worry that she will die getting her teeth pulled or something...she is so fragile.
So you should feel blessed that yours is not a "teacup" after all