Do preg test if: she is 12 days late from expected period. The likelihood of getting pregnant from sperm on underwear only is very low, but not impossible. Sometimes stress can cause a girl to be late as well. Urine preg test is reliable 7 days after missed period, but blood tests can also be done through her doctor's office and are reliable even before menses due date.
Answered 6/25/2018
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