Takes time: A blood or urine test may become positive before you miss a period but not necessarily.For any test to be positive, the new embryo must have time to enter and fix itself to the wall of the uterus.Then the cells begin to generate a hormone that helps maintain the pregnancy.That hormone must be in large enough concentration that it can be detected in blood or urine.Negative tests are common early on
Answered 9/24/2015
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Day after tomorrow: Patience is a virtue. Test on Sept. 27th. If a urine pregnancy test is positive but done too early, that would still be a valid result. But if negative, then one wonders if the test is a false negative, and will have to repeat it. Since there is no need to rush the test (that's right, there's no need to rush), doing it 3 weeks after sex will give a trusted result even if it is a negative result.
Answered 9/27/2015
2.2k views
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