A urine pregnancy test works by measuring the amount of hCG (pregnancy hormone) in your urine. Typically you need to have missed your period for these to be accurate, particularly a positive result. If you have a positive result a couple of days before this missed period, hCG has been detected and you are pregnant.
Am I Pregnant?
As the tests become more sensitive, more and more women will have positive results earlier. That leaves the problem of taking a pregnancy test prior to your missed period and getting a negative result.
If you get a negative result and you have tested prior to your missed period, you should wait for a couple of days and repeat the test.
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