Plan B period delay?

Julie

So about 4 days ago me and my boyfriend were laying in bed and I wanted to see what it felt like without a condom. We did and it was VERY brief but just to be sure I took a plan b. I took it Friday night and I was supposed to start my period on Friday. I still have no period. Is this normal for after taking the pill? How many days will it be before I get my period?