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A member asked:
Could an emergency room urine preg test give a false negative 21 days after sex. i thought i had a period it was light and took the test week after ?
A doctor has provided 1 answer
Very reliable at 21d: Urine pregnancy tests are very accurate and not affected by foods, herbs, common illnesses, sexually transmitted diseases, or medications. A urine test gives a very accurate result by 3 weeks after sex (3 weeks after when conception might have been). If done sooner such as less than 2 weeks after sex, a positive result is likely real, but negative result may be due to testing too soon.
Answered 6/26/2018
315 views
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