You are probably going to have to do a bit of lateral thinking to grab this number from the autonumbered field in your document. The following macro should work for the paragraph at the cursor
Code:
Dim ofld As Field
Dim orng As Range
Set ofld = Selection.Paragraphs(1).Range.Fields(1)
ofld.Unlink
Set orng = Selection.Paragraphs(1).Range.Previous
orng.Collapse 0
orng.MoveEndUntil Chr(9)
orng.Select
MsgBox orng.Text
ActiveDocument.Undo