Pregnancy can generally be detected approximately 10 days after conception using at-home pregnancy tests that detect the hormone human chorionic gonadotropin (hCG) in urine. Some highly sensitive tests can detect pregnancy as early as 6 days before a missed period, which corresponds to about 8-10 days after ovulation or fertilization. Blood tests can detect pregnancy even earlier, around 7-10 days after conception, as they measure lower levels of hCG in the blood compared to urine tests. Key points:

• Most at-home urine pregnancy tests can detect pregnancy about 10 days after conception (fertilization) or 4 days before a missed period.
• Some sensitive tests can detect hCG levels as low as 6.3 mIU/mL, allowing detection about 6 days before a missed period.
• Blood tests can detect pregnancy 7-10 days after conception due to their higher sensitivity to hCG.
• For the most accurate results, it is generally recommended to take a pregnancy test after a missed period, around 14 days after ovulation or conception.

Thus, pregnancy can be detected as early as about 6-10 days after fertilization with sensitive tests, but for reliable accuracy, testing around the time of the missed period (about 14 days after ovulation) is best.