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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.
Methods of confirming a positive pregnancy test after implantation bleeding. Having a positive pregnancy test 6-8 days after implantation (on day 26-28 of an average 28-day cycle), it is best advisable to confirm the result.This can be done with the help of closer attention to subjective pregnancy symptoms, such as:1  Nausea and vomiting;imilarly, a false negative pregnancy test result can be due to too early testing (when the HCG level has not yet reached the minimal mark, subject to detection). Causes of a false positive test result: 1  A tumor that produces chorionic gonadotropin; 2  Hemolysis (destruction of blood cells);