After a BFN did AF not turn up and you got a BFP

I have been temping and all has been going great I am still above the cover line. AF is supposed to come today and I have had a few strands of pink only when wiping nothing else..I tested today and unfortunately I had a BFN. I'm wondering if AF is returning or if I should test again ??
 I am 13 DPO... 

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