I'm spotting and my period is late but all tests are negative

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My period is usually regular but im 3 days late. I started spotting 2 days before my period was due and it lasted for 6 days. Over the span of the last 5 days, I've gotten 5 pregnancy tests at home plus 2 blood tests at a lab and theyre all negative. Are tests supposed to be accurate when I'm 3 days late? Im terrified i dont want to have kids