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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.
There are early detection pregnancy tests available that can confirm pregnancy as early as 6 - 8 days after conception has occurred (well before a missed period). Early pregnancy symptoms can sometimes happen before a missed period and before a positive pregnancy test. Especially the 3, 4, 5, and 6 weeks pregnant signs. Early pregnancy symptoms and signs are usually related to the pregnancy hormone hCG or Human Chorionic Gonadotropin which is responsible for pregnancy signs.