Had sex on an assumed first day of ovulation, did not take plan b until 4 days later. (just learned of it) what are my chances of pregnancy?

Depends...: There are so many factors that will predict chances of pregnancy; age and state of health to name 2 important ones. Generally we say that the Plan B method is 60% effective if taken on the 3rd day after sex. Some data suggests its effectiveness lasts through the 5th day post intercourse... but the numbers are unreliable. If you're