What Causes Delay In Periods While On Esteemed 35 ED?

Hi, I m on the esteemed 35 ED and recently I was taking it wrong because when it said start in the red section I assumed at the start which means I was taking the period ones first. So on this new pack I started in the red section on the sugar ones and I never got my period on the last pack and I have taken about 6-7 sugar pills and still haven t got it. What s happening? I ve used a condom when I ve had sex.