Suggest Treatment For Delayed Periods In Case Of PCOD

I was previously diagnosed with pcod. After medications for a year I got periods not on the accurate date but at least 4 to 10 days of delay. This time I did not get my periods and my test 20 days also was negative. I have taken primulute N 5mg 2 tabs per day for 3 days. Its been 9 days I completed the course and I have still not got my periods. Please advise what would b the issue.