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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 tests have certain instructions and before you make the diagnosis of a positive pregnancy test make sure that you followed all instructions. Most manufacturers suggest to read their test after 3 minutes and to NOT READ it after 10 minutes. Once you have a negative test after 3-5 minutes THROW OUT the test. Any positive test appearing only well after that time is inaccurate and cannot be considered positive. But a false positive pregnancy test can also happen after an hCG injection like it happened to Kim Kardashian.