What is the probably of getting pregnant if both were wearing underwear and the girl took a plan b 4 days after? also, the occurrence happened days before a menstrual cycle was supposed to start. when would a test be accurate?

The exposure cited has minimal if any risk-sperm are fragile & die quickly outside the vaginal environment. Pregnancy has been documented from exposure at any time in the cycle, including menses. Tests are usually accurate starting 2-3 weeks after exposure.

Pregnancy is not possible in above circumstances, if no intercourse took place. Contraception remains otherwise key in avoiding undesired pregnancy and associated anxiety and when intercourse becomes possible.

While you are not at risk of pregnancy from this episode, your behavior is putting you at risk of pregnancy and STDS. Visit this site for guidance on safe sex: https://www.hopkinsmedicine.org/health/wellness-and-prevention/safer-sex-guidelines Get HPV vaccine Use contraceptive all the time, every time. Wish you good health!