Preg. tests accurate: Ella and other emergency contraceptive pills work the majority of the time, but not all the time. A home urine pregnancy test done correctly gives a very reliable result 3 weeks after sex (3 weeks after when conception might have happened). If done sooner, a positive result is likely real, but a negative result may be due to testing too soon, and therefore lead to a repeat test.
Answered 6/17/2018
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