Is It Normal To Experience Very Light Or Missed Periods After Using Triphasil For 2 Years?

You Hi, I have been using triphasil for the past 2 years , each month my flow becomes less and the days decrease. Last month I had my period for 2 days in which both were just about the size of a teaspoon drop and this month I did not get ny periods, I just noticed small drops when i use the loo and that is only when I am wiping myself. Is this normal or is there a possibility that something is wrong?