I am 28,I was using postinor2 for more than 7months.in my case I would take the two tablets at once,then I stopped using it 8months ago cos I noticed that my period do nt come on d due date,instead it comes on the date I end my last period.for instance if I see my period on 9th and I finish on 13th,instead of my period to come on 8th or 9th,it will come on 13th.ever since I stopped using it 8months ago,I have nt bn able to get pregnant and my period is still the same.pleas help me on this,I m really worried.thank you.