How likely is it that I am pregnant?

The pill is 99% effective at preventing pregnancy if you don't miss any pills so anytime you completely miss pills, this lowers the effectiveness. There are many birth control pills that can be used as emergency contraception, but Yasmin is not one of them so if unprotected occurred within the last 5 days, you will need to obtain emergency contraception. When you miss 3 or more pills in your pack, you would keep taking a pill every day until Sun, then on Sun start a new pack