took pt 3 days after what i thought is my period

Kween
So my last period was sept 14,15 only lasted 2 days of spotting dark red, no cramps at all, which is weird.. so i took pt on the 16th after what i thought is my period.. i thought itwas negative, so i didnt wait but i kept my pt, now 3 days after my period i kinda look at my used pt and there it was.. i dont know what does it mean.. anyone?

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