A member asked:

What is the probability of a home pregnancy test being a false negative when my period is 3 days late?

A doctor has provided 1 answer

Check later, not now: Home pregnancy tests are very accurate and not affected by foods, herbs, common illnesses, sexually transmitted diseases, or medications. A correctly done urine test gives a reliable result 3 weeks after sex (3 weeks after when conception might have happened) or 1 week after missing a period. If done sooner, a positive result is likely real, but a negative result may be due to testing too soon.

Answered 2/7/2016

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