How To Take Micropil The One With 21 Tablets? In

How to take micropil the one with 21 tablets? In row 1 what day will i start taking it? Been taking it for 2months now and until now i havent got my period.I just finished my 21 pills last 2 days and i am expecting my period will be this week. The last two tablets was lost so i bought a new pack. And still i havent got my period for two months now. Is this normal to micropil user if ur having a mistake taking it?