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How long after sex is blood pregnancy test accurate

A 18-year-old female asked:
Dr. Robert Kwok
Pediatrics 33 years experience
Yes: Three weeks after sex is long enough for a pregnancy test to show whether or not a woman got pregnant 3 weeks ago.

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A 17-year-old female asked:
Dr. Laura Anissian
Internal Medicine 21 years experience
Early: This may be too early but often it can be positive. If it is negative, I would check another test in one week.
Dr. Gurmukh Singh
Pathology 49 years experience
3 weeks after sex: Conception occurs within day or so of the sex. It takes about 3 weeks for the embryo to make enough HCG for a positive pregnancy test. Blood test may ... Read More
A 18-year-old female asked:
Dr. Anne Hale
Specializes in Obstetrics and Gynecology
Yes: Yes it should be accurate. I have seen a few women who are pregnant and the test is negative for a while. If you are still doubting the results then... Read More
A 31-year-old female asked:
Dr. Joel Rivera Jimenez
Obstetrics and Gynecology 18 years experience
Positive test hcg: Its probably a little early for commercial test to turn positive at this time. Most of them work or turn positve the day before you missed your period... Read More
A 22-year-old female asked:
Dr. Robert Killian
General Practice 28 years experience
Missed Period: Probably if you have also missed a period. If you have not missed a period yet you tested too soon.
A 27-year-old female asked:
Dr. Raj Syal
Dr. Raj Syalanswered
Obstetrics and Gynecology 33 years experience
Very accurate: You should be able to trust the results.
A 34-year-old female asked:
Dr. Michael Sparacino
Family Medicine 37 years experience
See below: Preganacy is always a possiblity. Purchase a home pregnancy test. These become positive at about the time youd start your next expected period. If ... Read More
A 19-year-old female asked:
Dr. Robert Kwok
Pediatrics 33 years experience
Accurate, and...: Having a normal, regular menstrual period means a woman is not pregnant... meaning she doesn't have to do a pregnancy test.
A 18-year-old female asked:
Dr. Jeff Livingston
Obstetrics and Gynecology 22 years experience
Take a test: Home pregnancy tests are very accurate. They are the same tests used in a doctors office. They can detect a pregnancy 7-10 days after conception. The ... Read More
A 18-year-old female asked:
Dr. Robert Killian
General Practice 28 years experience
Can I be pregnant?: Yes, of course. You begin testing if you have been sexually active and when you miss your normally scheduled period.

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