When Should I Expect Periods After Taking Primolut-N?

Hi, due to my irregular periods my gyne advised me to take Registron for 10 days in feb and my period came on 7th of march. but again she prescribed to take Primolut N for 5 days from 20th day of my period. even after taking this tab for 5 days, i have not got my periods yet. pls advice when can i expect my periods.

My age is 32 years unmarried.

thanks,

Pam