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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.
Though it is possible that a pregnancy test will detect a pregnancy a couple of days before the start of your period, a false negative is more likely in this time period. Take the test after the time when your period should have started and it will be much more accurate. By 1 week + the test should be positive if you're in fact pregnant.