What Are The Chances Of Pregnancy After Taking Ipills?

I am taking the pill yasmin, I am currently on the fifth of the seven day 'pill free' period.

I have been sexually active and believe that I have come into contact with my partners sperm.

Should I go to the chemist and take the morning after pill, or take my yasmin pill two days earlier than normal?

Please can you assist me with my query?

Thank you