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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.
An ultrasound can detect a pregnancy as early as 4 to 5 weeks after your last menstrual period. A transvaginal ultrasound will give a clearer view than an abdominal ultrasound at this early date. The earliest sign of a pregnancy is a tiny sac in the uterus, which may be seen as early as 4 weeks after your last period.