unprotected sex

recently i had unprotected sex on the 19th of june ( one of my fertile days with a 18% chance of pregnancy) & he used the pull out method. again on the 22 of june (day of 3% chance of pregnancy) we had unprotected sex & used the withdrawal method.. after i took a plan b because i was scared & paranoid.. today again on the 27th of june we had unprotected sex & used the pull out method .. is there a chance i could get pregnant? should i take another plan b ? or should i wait it out .. please help !!