Can Positinor-2 Be Taken As Morning After Medication?

Hi, am 22yrs old. I had sex with my boyfriend last week and we used withdraw method but because i was not so sure how careful he had been, i took postinor-2 tabs the next day. However before i could have my next periods we had unprotected sex again and he ejaculated inside me. Can it help if i take postinor 2 again to prevent pregnancy?