Is A Delay In Menstrual Period After Unsafe Intercourse Normal?

I m 32 yrs old with 80kg weight and 155cm height, I had an unsafe intercourse on 21st days of my last mensuration cycle, and took a pill off unwanted 72(mankind) within 10 hrs. My mc has not started (till today) after 5 days of normal date of mc. Please tell me what happend.