Typically, when we ask for confirmation/denial of a statement, we say something like the following:
We turn left here, don't we?
You have a cat, don't you?
We've met before, haven't we?
pairing a positive statement with a negative question, or
We don't need that, do we?
You don't know anything about this, do you?
pairing a negative statement with a positive question.
However, sometimes positive statements are paired with a positive question
We take a left, do we?
You had to be a big shot, did you?
You've been to Prague, have you?
Is this correct? Does it change the meaning in any way? Are the three forms interchangeable?