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How Long Does a Positive Result Last on a Home Pregnancy Test? Not all home pregnancy tests have the same level of sensitivity to hCG (human chorionic gonadotropin), the pregnancy hormone, so some will show a positive result early in a womanâs pregnancy, and some wonât register positive until up to a week after a missed period.
Since the test will not get a positive result until enough HCG is present in the urine, home pregnancy tests work at varying points from the time of conception. According to the Mayo Clinic, most pregnancy tests will not show a positive result until at least one day after your missed period, or about 12 to 14 days from conception. The one exception to this rule is the First Response Early Pregnancy Test, which has shown the ability to detect pregnancy up to five days before your period.