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A 17-year-old female asked:

i got a blood test for my beta- hcg 4 days after unprotected sex and was negative, is 4 days to early to test?

1 doctor answer3 doctors weighed in
Dr. Robert Killian
General Practice 28 years experience
Testing: Yes. Of course. Conception takes one to five days after sex to occur. And then a fetus is not in any way physically or chemically to the mother for ten to fourteen days after conception. This has to happen before any test could be accurate. I cannot believe any honest doctor would spend money on a test in this scenario.
Dr. Stephen Richards
Obstetrics and Gynecology 42 years experience
Depends on where you were in your cycle, that is early. If you had sex at mid cycle, the blood test could be positive before a missed period.
May 4, 2014

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Last updated May 4, 2014

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