I ended my period two weeks ago on 20/08/09. The following weekend I had sex with my boyfriend but the condom slipped off so there was a spill. We wanted to play safe and I decided to take the emergency contraceptive, Postinor-2, on 23/08/09. It made my menses came a week after I took the pill, on 31/08/09. Is this normal?

It felt like my usual menstruation as I experienced mood swings, acne, headaches and cramps. Is having an earlier menstruation normal after Postinor-2 in this case?

Please get back to me as I'm worried. Thank you.