Unprotected sex on august 10. i took plan b after 4 hours. 6 days after i spooned/bleed for 5 days. my period came and it lasted 1day shorter. taken prego test, all negative. blood test came less than1. pelvic exam, everything good. % of being prego?

Pregnancy unlikely: Today's home pregnancy tests are very accurate and not affected by foods, herbs, common illnesses, sexually transmitted diseases, vaginal spotting, or medications. A test gives a reliable result 3 weeks after sex (3 weeks after possible conception) or 1 week after missing a period. If done sooner, a negative result may be due to testing too early, such as less than 2 weeks after conception.