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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.
Home pregnancy tests detect the presence of hCG in your urine. Some home pregnancy tests are more sensitive than others. The more sensitive tests may be able to detect low levels of hCG as early as four days before your period is due, or seven days after conception.