If i took the morning after pill within 11hrs after having unprotected sex what are my chances of not being pragent?

Plan B: Taking the morning after pill as you did should reduce the chance on an unwanted pregnancy.

Emergency: contraception is up to 89 % effective when taken within 72 hours (3 days) after unprotected sex. It can reduce chance of pregnancy by up to 95% if used within 24 hours. It continues to reduce the risk of pregnancy up to 120 hours (5 days) after unprotected sex, but is less effective as time passes.