Implantation bleeding?

Okay so I saw this yesterday and today only once each day. Is there chance it's implantion? I am a week away and 2 days away from my period and my fertile window was Dec 13 to 19th with ovulation being the 18. I'm just a little unsure if it could be implantion bleeding or if it's possible it might just be from ovulation? The lighter photo is today

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