Help me !! Late period negative HPT

I was due to start my period on 5/6 I’m thinking I had implantation bleeding that day as I bled very light and only for a day at the most . I have took 3 hpt and they are all negative. I’m so confused , my cycles are regular. Here I am 5 days and still no period or a positive test . Please give me some advice or help TIA !!

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