Actually no, although it does depend on the brand of test, some tests are made to test for lower levels of hormones before your period, whereas some
are meant for after you missed period. It also depends on the person, wheras someone might test positive a week before there period another person might not test positive until a fortnight or more after their missed period. So if you want to test go ahead but if it comes back negative and you miss you upcoming period, then maybe test again in a week or so.
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