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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.
Pregnancy Test Positive After 24 Hours. If you take a home pregnancy test, the results are simply not valid 24 hours after taking it. If you take the time to read the instructions that come along with your test, you know that you need to look for results within minutes of testing and discard any results after approximately 10 minutes.