Confused on if negative really mean negative

Ok so I been TTC for over a year and every month I get my hopes up cause I never reg anymore after my 1st child. My question is I took a chemical preg when 4 days late. Is that too soon to test it was neg now I am 8 days late and still no period. I so anxious and not sure if sure test again. Going on vacation soon and don’t want do anything harm me if I am pregnant.

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