Implantation bleeding?

So I thought I felt implantation (a very distinct cramp compared to my other pregnancies) on 10 dpo. On 11 dpo (yesterday) i had some discharge when I wiped a couple times that was tinged with red/brown, but nothing else. Today is 12 dpo, no period and a negative pregnancy test, could yesterday have been implantation? If it was when would a test be positive?

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