The best time to take a pregnancy test is on the first day of a missed period or later for accurate results. Some tests can detect pregnancy earlier, but waiting until the missed period day reduces the risk of a false negative. For even more accuracy, waiting about a week after the missed period is recommended. If the menstrual cycle is irregular or the period date is uncertain, it is advisable to wait at least 21 days after unprotected sex before testing. Pregnancy tests detect the hormone hCG, which typically becomes measurable about 7 to 10 days after ovulation, increasing the chance of detection after a missed period.
In summary:
- Take a test on the first day of a missed period for about 90% sensitivity.
- For about 97% accuracy, wait one week after the missed period.
- If uncertain about cycle regularity, test at least 21 days post sex.
- Testing too early can result in false negatives due to low hCG levels.
This timing balance helps ensure the pregnancy test results are reliable.