HPT vs OPK: Home pregnancy tests are meant to tell you whether you're pregnant or not. As always, they need to be used as directed so follow the instructions closely (w/answers in minutes). They're best when used after you've missed your period, in other words, 4 weeks after your last menstrual period. Ovulation prediction kits, on the other hand, are used to determine when you're ovulating, not pregnant.
Answered 5/4/2013
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