Reasons for spotting but not pregnant?

I had some light spotting at 8-9dpo. I was expecting my period as bbt dropped. It’s now 11dpo, no sign of period but temps haven’t risen back much (still0.1 below previous highs) and got a bfn.

What would cause spotting at that point that isn’t because of period or pregnancy? I’ve had recently short luteal phases so I’m curious if I’m low in a particular hormone?

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