Need a answer cause google ain’t helping

Any other time I’ve been pregnant, it showed on the tests from the drug store days before my period would of started.

This time I’ve been testing like crazy and all the tests say negative but my period is 6 days late🤔 why? I’ve never had late periods or periods not show up . They are always regular. I had sex after my last period and they pulled out each time (I know that’s not a good/ reliable method don’t bash me please)