What Can Be The Effect Of Postinor2 On The Fetus?

Hi, i'm trying for a baby. Had sex eight days ago *nd took postinor 2. The next day, I had sex again. This time no pills. six days later I had sex. What is the possibility of my being pregnant. Cos I want to take postinor 2. Also what's the effect of postinor on the fetus if i'm already pregnant.