Plan B and periods

Aulbrey
So I am currently 6 days late for my period. On january 26 I took Plan B and got my cycle a week early on the 30th to feb. 5. Im wondering if that can mess up my whole cycle overall since i started my period early. (The cycle before that was the 10th to the 15th). Should i be worried? (And i took two pregnancy tests and both were negative) 

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