Suggest Remedy For Delay In Withdrawal Bleeding After Completion Of Regestrone Medication

i was under the medication of regestrone 5 mg for 7 days. during the 4th day, i had unprotected sex as i was told that regestrone is a contaceptive. after 7th day of completion of the medication course it is 24 hrs now , i didnt get my period. what is the normal gap between stopping the mecine and getting the period