Troubleshooting:Auto-Fill Macro Help Error

Auto-Fill Macro Help

I am trying to create a Macro that will auto fill a formula in A2 all the way down to all of the cells in Column A.
Currently I have a bit of code, however every time I play it, it wipes out the formula already in A2 and just auto fill 0's all the
way down, I need the formula to figure out the last cell in column A and auto fill to that cell.
Since column A will have a different number of rows every week I wanted to make a macro that could account for that. 

Selection.Autofill Destination:=Range("A2:A" & Range("B" & Rows.Count).End(xlUp).Row)

Solutions to the Problem Auto-Fill Macro Help

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