You can take a pregnancy test for accurate results at least 14 days after having unprotected sex. This timing allows for fertilization, implantation, and sufficient production of the pregnancy hormone hCG to be detectable by the test. Testing earlier than 14 days often leads to false negatives because the hormone levels might not be high enough yet. For even more accuracy, waiting until after a missed period (about 21 days after sex) is recommended. Some early detection tests claim to work sooner, but waiting increases the likelihood of reliable results.
Here are key points about the timing:
- Fertilization occurs within about 24 hours after sex.
- Implantation happens approximately 6 to 12 days after fertilization.
- hCG becomes detectable 2 to 3 days after implantation.
- Testing too soon (less than 10-14 days post-sex) is a common cause of false negatives.
Taking the test on the first day of a missed period or later is the most precise approach if you track your menstrual cycle. If periods are irregular or unknown, aim for about two weeks after unprotected sex to test.
