It is generally best to wait until at least the first day of a missed period to take a pregnancy test for accurate results. Some very sensitive tests can be used a few days before the missed period, but to reduce the risk of false negatives, waiting until the missed period day or even about a week after improves accuracy. If the menstrual cycle is irregular or the period date is unknown, testing about 21 days after unprotected sex is recommended. Testing too early can result in inaccurate results because the hormone hCG may not yet be at detectable levels in urine. Key points:
- Testing from the first day of a missed period is usually accurate.
- For more reliable results, waiting one week after the missed period is advised.
- If periods are irregular, take the test 3 weeks after unprotected sex.
- Morning urine or holding urine for a few hours before testing can increase hCG concentration.
- Positive results should prompt contacting a healthcare provider for confirmation and next steps.
