Are the tests (probably) accurate?

I’m on the pill and I’ve never missed a pill. The most recent time I had sex was 19 days ago. I’ve tested 4 times (2 first response tests and 2 dollar ones), all are negative. I’m just having weird Symptoms like nausea. I got my period a week ago it was just shorter than usual but definitely wasn’t just spotting. Do you think the tests are accurate?

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