Though plan b is 72hrs.if taken on friday after unprotected sex right then sat and sun had unprotected sex and was ovulatin did i need to take anothr?

Maybe one more dose: Plan B typically can delay ovulation up to 5 days - so if you had sex 2 days later, and theoretically, the sperm can survive up to 72 hours - it would seem like a good idea to take one more Plan B dose asap after the sunday unprotected intercourse. Just to be very safe. Expect to have some irregular bleeding and think about getting on some form of more reliable birth control.