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technically, you wouldn't be able to know if you are one week pregnant because conception wouldn't even have taken place. day 1 of pregnancy starts on the first day of your last period. if you mean one week after conception, then it is likely that a pregnancy test will still be negative. implantation is what triggers the hormones that give you the positive pregnancy test, and implantation typically takes between 7 and 10 days. the best best is to wait until you are a day late for your expected period and test then. even tests that say they can identify pregnancy 5 days sooner may not show a positive result until you miss a period, because the hormone levels are not yet high enough to register.

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Q: Can a pregnancy test show negative if only one week pregnant?
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