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How accurate is a pregnancy test if it was taken 21 days

Customer Question
after sex? My gf took...
How accurate is a pregnancy test if it was taken 21 days after sex? My gf took plan b immediately after intercourse and got her period 3 days afterwards.
Submitted: 4 months ago.Category: OB GYN
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Answered in 3 minutes by:
7/23/2017
OB GYN Doctor: Dr. Norm S., Board Certified OB/GYN replied 4 months ago
Dr. Norm S.
Dr. Norm S., Board Certified OB/GYN
Category: OB GYN
Satisfied Customers: 11,259
Experience: Over 30 years of experience in OB/GYN practice, including teaching students. Fellow of American Board of Obstetrics and Gynecology.
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A good pregnancy test will always be positive 21 days after sex if pregnancy occurred.

The fact that she got her period 3 days after (If it seemed like a real period) is also good evidence that pregnancy did not occur.

I don't think there is any significant chance that your girlfriend is pregnant. Best regards.

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Customer reply replied 4 months ago
Ok well she has been feeling tired lately but has been having trouble sleeping. She has also had some lower back pain and I think her breasts have gotten a little bigger. Should she take another test ?
OB GYN Doctor: Dr. Norm S., Board Certified OB/GYN replied 4 months ago

It's probably worthwhile to do another pregnancy test, just to be sure. I'm pretty sure it will be negative.

Her tiredness and trouble sleeping could be a combination of hormonal changes and maybe stress. The larger breasts may also be from hormonal changes.

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Customer reply replied 4 months ago
Ok well tomorrow will make like day 25 after sex. Will that be 100% accurate?
OB GYN Doctor: Dr. Norm S., Board Certified OB/GYN replied 4 months ago

Yes, 100%.

Please click the rating stars. Thank you.

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Customer reply replied 4 months ago
Would she be having symptoms by now? Thank you for your help!!!
OB GYN Doctor: Dr. Norm S., Board Certified OB/GYN replied 4 months ago

If she were pregnant, she may or may not be having symptoms now. But if she has symptoms, and her test is negative, you know the symptoms are not from pregnancy.

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Dr. Norm S.
Dr. Norm S.
Dr. Norm S., Board Certified OB/GYN
Category: OB GYN
Satisfied Customers: 11,259
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Experience: Over 30 years of experience in OB/GYN practice, including teaching students. Fellow of American Board of Obstetrics and Gynecology.

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