A pregnancy can be detected as early as 6 to 8 days after ovulation with highly sensitive pregnancy tests that detect the hormone human chorionic gonadotropin (hCG) in urine. Some early-detection tests, like Clearblue Early Detection, can detect pregnancy up to 6 days before a missed period (which is about 5 days before the expected period). However, the accuracy increases the closer to or after the missed period you test, since hCG levels rise rapidly in early pregnancy. Testing with the first urine of the day is recommended when testing early for the most concentrated hCG levels. If a test is negative before the missed period, it is advised to retest on the day the period is expected or a few days after to confirm results.

In summary:

• Earliest detection by modern tests: about 6-8 days post ovulation
• Early detection tests can detect pregnancy up to 6 days before missed period
• Accuracy improves significantly after the missed period
• First morning urine is best for early tests
• Negative early results should be confirmed by retesting after missed period

This timing depends on implantation occurring successfully and hCG levels building up enough to be detected by the test.