spotting for two weeks?

Shelby
I've never experienced this before. I am on cycle day 51 (obviously late). I've been having light spotting now for almost two weeks. I have 0 other symptoms, no pain, no cramps, no soreness, nothing. My doctor put me on metformin about a month and a half ago and I'm wondering if this has happened to anyone else who has taken metformin. 

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