I had unprotected sex with my boyfriend on January 13th. He pulled out before he came. My period was suppose to start January 15th but I didn't realize it was late till two days later on the 17th. I felt like my period was going to start on the 17th but nothing happened so I got worried. I took a Nora-BE as an Emergency Contraceptive Pill that night. Since I felt like my period was coming should I have left the pill alone? Taking the pill once will that mess up my period that's suppose to be happening this week? Should I continue the Nora-BE?