Could this be implantation bleeding?

I had af like cramps all day yesterday and when I went the the restroom, I had the slightest brown spot in my underwear (like dry blood). Woke up today and tested and it was a bfn. No more cramps, but a pounding headache and a lovely face suddenly full of pimples ? could this be implatation? My other app says af isn't due until the 29th and this one says 28th.

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