| http://www.w3.org/ns/prov#value | - Some people, yes, do not show up on a pregnancy test when their period is late but this is rare and is usually due to the fact that they either ovulated later than they though - so their period is going to be later and it was too early to test, or they have not used first morning urine so their urine was too diluted to pick up the hCG hormone in early pregnancy.
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