Nearly black blood on a tampon left overnight on day 4 of period

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NSFW!! Help, I don't know what this spotting is. I am right in between my last and next period, has never happened to me before. I took a test and It came

is this concerning? i've only had my period for 3 1/2 years : r/Periods

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Bleeding while Pregnant? : r/Periods

is normal for my tampon to fill this fast? i had it in for about 2-3 hours : r/Periods

anyone know possible reasoning for this? : r/Periods