Brownish bleeding CD18 please help

Had some sharp cramps on my left side last night and woke up to this brownish blood. It's fairly light and the pain is there but it's a bit dull now. Any idea what this is? Early period (af not due for 10-13 days)? Ovulation bleeding? Implantation bleeding? Something else? My cycles have been super regular.

Please, any insight would be much appreciated, I'm freaking out.

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