Suggest Remedy For Delay In Periods After Taking Unwanted 72

hi,i am 23 years old.i took unwanted72 after having unprotected sex with my boyfriend within 48 hours.but i had very little menstrual bleeding 4-5 days before my normal period for 1 day.After that no periods happened this month..is it normal effect of taking unwanted 72?i am very much afraid..is there any probability of pregnancy?please help me out..