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You are pregnant but you test negative. Quantitative blood tests and the most sensitive urine tests usually detect hCG shortly after implantation, which can occur anywhere from 6 to 12 days after ovulation and implantation is usually the deciding factor to answer the question how early can pregnancy be detected.
The new First Response Early Results Pregnancy Test claims it is sensitive enough to detect the presence of hCG as early as three days before you have even missed your period. That is four days sooner than other tests on the market.