Possible: Urine pregnancy tests first turn positive about a week after conception. Depending on the dilution of the urine, a test may come back negative, if the urine is highly diluted, and positive, when the urine is concentrated. A urine sample taken after an extended resting period (6 - 8 hours of sleep, typically in the morning) is the preferred sample to use for the test.
Answered 1/11/2015
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