Hard to guess: "There may have been semen" means there may have been a chance of pregnancy. Who can guess? A urine pregnancy test, done correctly, gives a reliable result 3 weeks after sex (3 weeks after when conception might have occurred), or 1 week after missing a period. If done sooner, a positive result is likely real, but a negative result may be due to testing too soon, and thus lead to a repeat test.
Answered 2/5/2016
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