Short answer: For the most accurate result, take a home pregnancy test on or after the first day of a missed period, or at least 21 days (3 weeks) after unprotected sex if you’re unsure of your cycle.

Best timing

• Regular cycles: Test on the first day your period is late; accuracy improves if you wait up to one week after the missed period.
• Irregular or unknown cycles: Wait at least 21 days after the sex that could have led to pregnancy before testing.
• Early options: Some “early detection” tests can turn positive about 10–12 days after ovulation/conception, but testing this early raises the chance of a false negative, so confirm again after the missed period.

How to test

• Use first-morning urine for earlier testing because it’s more concentrated; after a missed period, most tests are accurate any time of day.
• Follow the package instructions closely and read results within the specified window.

If the result is unclear

• Negative but period still hasn’t come: Retest in 48–72 hours.
• Positive: Contact a healthcare provider to confirm and discuss next steps.
• If you had unprotected sex within the last 5 days and do not want to be pregnant, ask about emergency contraception as soon as possible.

Note: This guidance is general and not a substitute for professional medical advice. If you have symptoms like severe pain, heavy bleeding, or fainting, seek urgent care.