Sadly false negatives are very common. It can take some women months, well into their second trimester, before they get a reliable reading from a test.
The only advice I can really give you is to wait until your period is at least 2 weeks late, then test using first morning urine. If that test is negative, wait for your next period and if that's missed, test again or get a blood test. If those tests are also negative, keep testing every two weeks until you get your period, or a positive result. If 2 periods have been missed without a positive result, and without a period, it's definitely time to talk to your doctor about an ultrasound to confirm that you either are, or aren't pregnant.
Good luck.
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