Counting Number Of Used Rows/columns In A Sheet

In my Macro , i add a worksheet and depending on certain conditions i decide whether to populate it or not.

At a later point of time i am checking if the newly created worksheet is empty or not using the following check :

If ActiveWorkbook.Worksheets(ISheet).UsedRange.Rows.count <> 0 Then

Now what i have noticed is that even in cases where the "ISheet" is empty the above condition evaluates to true for the first attempt. I cannot understand why ?

let me know if the query is ambiguous and i will post the code snippet