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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.
If you do a pregnancy test on the first day of your missed period, and itâs positive, itâs probably about two weeks since you conceived. You can use the pregnancy due date calculator to work out when your baby is due. A negative result is less reliable.