Hi Doctors. I Would Like To Ask If What I

Hi Doctors. I would like to ask if what i have done is still effective. I took nordette (4pcs) - 72 hours after unprotected sex, then took another 4pcs after 12hours of the 1st dosage. I feel nauseous, feels like vomiting, my breasts feel tender, and i have occassional cramps and headaches. Is that normal? When will the withdrawal bleeding come, and if it comes, can they s be considered menstruation? Thank you Doctors. Hope someone can answer.