Hi, I Have Taken Primolut N For More Than 3

Hi, i have taken primolut n for more than 3 years.but stopped it from october,2015.then i got my period on november,which was normal.after that i got it no Jan,2016 but flow was very less and it got over after 3 days whereas my normal cycle duration is 6-7 days.again on feb i got normal period.but after that its been 2 months i did not get my period.my last cycle date was 12th Feb,2016.I am 29 years old.

Please tell me what should i do?