You can take a HPT as early as 4 days before your period is due. Make sure the HPT box says that it test ? days before period. Or you can take it 1 to 2 days after you cycle is due. what if you dont know when your period comes Answer Wait until at least 12 days after intercourse, better to wait two weeks. you can take the test at least one week after day/night in question but i would wait at least 2 weeks just to make sure. and make sure you buy it from a place that they wouldn't have been on the shelf for a long period of time like Wal-Mart or CVS or any real busy drug store or retail store. After you have missed a period.
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