I had unprotected sex on saturday and then took the plan b pill monday morning .. am i going to be ok ?

Plan B is designed: to work in a pinch when the risk of conception is good. If you had unprotected intercourse before or after 2 days of suspected ovulation date, that is within the danger window. Monitor your hormonal response in the next 2 weeks, as you should have some bleeding associated with the Plan B if it was successful. If no bleeding after 2 weeks, check 2 pregnancy tests 1 week apart.