I have girlfriend she's virgin i didn't have sex with her just i have sperm at her underwear in we been stress a lot in she been 12 days no period?

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.