Hello anonymous and thanks for your question.
Postinor-2 is a brand of medicine containing levonorgestrel as the active ingredient. It is used to prevent pregnancy when taken within 72 hours of unprotected intercourse. It is estimated that Postinor-2 will prevent 85% of expected pregnancies. 95% of expected pregnancies will be prevented if taken within the first 24 hours, declining to 58% if taken between 48 hours and 72 hours after unprotected intercourse.
It is not known whether Postinor-2 is effective if taken more than 72 hours after unprotected intercourse.There is no way of knowing if taking this drug at this time will be effective for you.
Hope that helps,