Levonorgestrel
"I took Postinor 2 within 12 hours of the unprotected sex then two days after had I brown spotting for 3 days. I read online that brown spotting is a sign of an early pregnancy. I was worried sick  I took a pregnancy test and the result was negative. I ate parsley then the next day my period came but it came 5 days early. It truly works !! Don't worry. Don't wait take it within the recommended time"