You could define a range name such as
RowMarker =$A$1000
Then this code on your change event will store the position of this marker against it’s prior position, and report any change (then stores the new position)
Private Sub Worksheet_Change(ByVal Target As Range)
Static lngRow As Long
Dim rng1 As Range
Set rng1 = ThisWorkbook.Names("RowMarker").RefersToRange
If lngRow = 0 Then
lngRow = rng1.Row
Exit Sub
End If
If rng1.Row = lngRow Then Exit Sub
If rng1.Row < lngRow Then
MsgBox lngRow - rng1.Row & " rows removed"
Else
MsgBox rng1.Row - lngRow & " rows added"
End If
lngRow = rng1.Row
End Sub