How to AutoFilter using IF conditions on VBA

I am really new to VBA and I got stuck on a filtering function that I cannot resolve looking online.

I basically built a login form which allows different users to see different data on a "Report sheet" once they log in. In the "Report sheet" I have two columns "P" and "Q" in which some names are reported.

Let's say:

P      Q
User1  User2

Paul   Bob
Martin Martin
Bob    Bob
Tom    Martin
Ralph  Bob

I then used this code on VBA:

Private Sub Worksheet_Activate()

Range("Report!$F$6:$Y$11").CurrentRegion.AutoFilter Field:=12, Criteria1:=Range("G3").Value

End Sub

**G3 is the reference cell for the name*

Now, if I login with Bob, using that code, the result will be:

P      Q
User1  User2

Paul   Bob
Bob    Bob
Ralph  Bob

That is correct! However, if I try to login with Paul, no result is available because he's not on the Field:=12 (column "Q").

I would like to do something like this: IF Paul is not on column "Q", stop filtering that column and start filtering column "P".

I tried with:

Private Sub Worksheet_Activate()

If Range("Report!$F$6:$Y$11").CurrentRegion.AutoFilter(Field:=12, Criteria1:=Range("G3").Value) Then 'do nothing

Else
Range("Report!$F$6:$Y$11").CurrentRegion.AutoFilter Field:=11, Criteria1:=Range("G3").Value

End If

End Sub 

but I don't really know what to state for positive results.

Thank you in advance to everyone that will help me on that.