Nested StreamBuilders Flutter - flutter

Question

So I'm currently using this nest of two streams, one to listen for AuthStateChanges, to know if the user is logged in, and another that listens to a firebase document snapshot request, to know if the user has already setup is account or not.
My problem is that the latter StreamBuilder(_userStream) only runs if the firts one runs, meaning that the only way for my _userStream to run is if the user either logs in or logs out(authStateChanges Stream).
This is inconvinient because after the user creates an account(moment where i run Auth().createUserWithPasswordAndEmail()), I need the user to go throw the process of seting up the account, and only after that the user can acess the mainPage. Only in the end of seting up the account theres a button to "Create Account", which changes the "HasSetupAccount" parameter in firebase to true. But because of the nested Streams problem, the app doesn't go to the mainPage until I force update it.
I hope my question is not as confusing as it looks :)
class _WidgetTreeState extends State<WidgetTree> {
#override
//construtor da class?
Widget build(BuildContext context) {
return StreamBuilder(
stream: Auth().authStateChanges,
builder: (context, snapshot) {
if (snapshot.hasData) {
return StreamBuilder(
stream: _userStream(),
builder:
((context, AsyncSnapshot<DocumentSnapshot> userSnapshot) {
if (userSnapshot.connectionState == ConnectionState.waiting) {
return const CircularProgressIndicator();
} else {
Map<String, dynamic> userData =
userSnapshot.data!.data() as Map<String, dynamic>;
print(userSnapshot.data!.data().toString());
if (userData['HasSetupAccount'] == true) {
return MyHomePage();
} else {
return AccountSetup();
}
}
}));
} else {
return LoginPage();
}
},
);
}
Stream<DocumentSnapshot<Map<String, dynamic>>> _userStream() {
return FirebaseFirestore.instance
.collection('Users')
.doc(Auth().currentUser!.uid)
.snapshots();
}
}