Suggest Treatment For Irregular Periods

I am planning to get pregnant. I have a missed period. My menstural is irregular. My last period was 1 November 2014. My Doctor advised to do UPT if negative take tab. primolut 10mg twice a day for 5 days, within 5 days you will get period. The UPT result is negative so I taken primolut for 5 days (15-19 Jan 2015). Now 7 days got over still I am not getting my period. What I have to do? Advice me please. Thank you.