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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.
So,if you think you're pregnant, it might seem like a really long wait, but doctors recommend you don't take a test until your period is a day overdue. However, the First Response Pregnancy Test says that it can detect pregnancy hormones in 52% of women three days before their period is due.