I have irregular periods and took a urine pregnancy test 21 days after having unprotected sex. What are the chances that this result could be a false negative?

Answered by 1 Apollo Doctors

Dr Siri Nallapu

General Practitioner

MBBS
5+ Yrs

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Taking a urine pregnancy test 21 days after unprotected sex usually gives a reliable result, even if your periods are irregular. The chances of a false negative are low if the test was done correctly with an early morning sample. If your period does not start within a week, you can repeat the urine pregnancy test for confirmation. If irregular cycles continue, a thyroid profile and prolactin test may be advised to check for hormonal causes. A serum Beta HCG test may help confirm the diagnosis of pregnancy.

Dr. Siri Suggests...

Take a URINE PREGNANCY TEST (CARD METHOD) Test or Take a BETA HCG (TOTAL) Test

Book URINE PREGNANCY TEST (CARD METHOD) Test Book BETA HCG (TOTAL) Test

Answered 08/09/2025

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