What Causes Irregularities In Menstruation?

I got married in 20 april 2014. My periods were irregular so consulted a doc. Was diagonised as having PCOD, increased Insulin Level, Hyperglycemia, Was adviced to take Myocyst scahets for 3 month & Macfolate tablet for ... I am taking those from 18 august 2014 & we r thinking of baby know it wont harmful if we are planning means ?? please guide