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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.
Both test for hCG levels; the only difference lies in that the former tests its levels within the blood stream while the later in the urine. A positive blood test will usually show a positive result 3 to 4 days after implantation, or roughly 9 to 10 days after ovulation.For a home urine test, however, a positive result will not be visible until a week after implantation or until you have a missed period.t went from a red color & 4 days to a brown & 2 1/2 days. 2 months ago same thing so I took a test it was negative. Then when I woke up next morning that same test showed a positive result. Last month my period was a week early brown in color & only 1 1/2 days long. Took another test same thing happened again.