Hi, I had sex on the 19th of dec 2012, took postinor2 2 tablet @once on d 20th, since then I haven't being myself, had abdominal pains, lover backache, I had 3days bleeding is it normal, am still having d backache, tender breast, feel tired, feel dizzy, having pains when I breathe, does it mean am pregnant I don't understand, help me pls........