Very unlikely but...
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. If a woman gets her normal regular period, then she is not pregnant, and a test is not needed.