The most reliable time to take a pregnancy test is at least 14 days after unprotected sex. This timing allows for enough production of the pregnancy hormone hCG to be detectable by the test. Some early detection tests may work slightly sooner, around 12 days after sex, but waiting until after a missed period (typically 21 days after sex) yields the most accurate results. Testing too soon can lead to false negatives because fertilization, implantation, and hormone production take time post-intercourse. Pregnancy tests can also be more accurate if done with first morning urine, and if you are unsure about your menstrual cycle, waiting about two weeks after unprotected sex is advisable for testing. Blood tests can detect pregnancy slightly earlier than urine tests, around 10-12 days post-sex. Summary:
- Wait at least 14 days after sex for a urine pregnancy test.
- Best accuracy is after a missed period (~21 days post-sex).
- Early detection tests may detect as early as 12 days.
- Testing too early risks false negatives due to low hCG levels.
- Blood tests can detect pregnancy a bit earlier, around 10-12 days post-sex.
