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A member asked:

How accurate is a blood pregnancy test 18 days after encounter? should i take a urine test next week to be absolutely sure?

A doctor has provided 1 answer
Dr. John Munshower answered

Specializes in Family Medicine

Be patient: Wait until a week or so after you miss your period, then check. The pregnancy tests, both serum and urine are very sensitive and work well, so generally if negative, then they're negative. If you miss a second period in a row, check again, then if negative, get gyn eval for abnormal secondary amenorrhea work up. Good luck.

Answered 2/19/2014

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If i take a urine pregancy test and if its negative if i take a blood test is there a better chance i could know early then the unire test?

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I took a quantitative blood test for pregnancy 18 days after sexual encounter, and a urine test 22 days after. Chance of pregnancy?

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Last period 03/12. Last sexual encounter 03/18. Period is 8 days late. All test negative including urine test at the doctors office today. What is the likeliness a blood pregnancy test will read different? Waiting on results?

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Do cryptic pregnancies exists? Can you have a positive urine test with negative blood tests and negative ultrasound? When does a babys face appear in an ultrasound?

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If a qualitative blood pregnancy test is done three weeks after a sexual encounter and done correctly can you trust the results if they are negative?

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