Is this a bedbug or a book lice or what?
This is not a bed bug, but some sort of book louse (order Psocoptera). Bed bugs have a more compact body shape, even in the early stages:
 (from http://www.bedbuginspectiongroup.com/facts/)
Compare this with a book louse, and I think it is much closer to your specimen:

(from https://commons.wikimedia.org/wiki/File%3ABook_louse_01.JPG)
Also, here is a page comparing them: http://bedbugger.com/2008/03/04/book-lice/
Hope you stay bed bug free!