She had unprotected sex and took the postinor 2 tablet both at once after 2-3 hours and the very next day she did the same thing will it be effective?

Postinor: Postinor, also known as Plan B or the morning after pill, is about 85-87% effective at preventing pregnancy. The likelihood that it will work depends on when during a woman's cycle it is used. The best method of emergency contraception is the copper IUD, so I would recommend that she have a copper IUD placed asap if possible. Also recommend using a more reliable form of birth control regularly.