How early a pregnancy can be detected depends on the pregnancy hormone hcG, which can be detected in the blood about THREE to FOUR days AFTER IMPLANTATION. Urine hCG can be detected about TWO TO THREE DAYS AFTER the blood hCG can first be seen. Detection of hCG depends on timing of implantation, NOW FOR THE MAIN EVENT.... ------------------------------------------- so hCG can normally be detected in the *blood between *9 and *16 days after ovulation (URINE HPT: 12-19 days after ovulation). SO, if your test are neg at 10-12dpo and you havent started af yet it may be early.