hi, i had my period on the 18th of last month like always, which lasted 4 days. then i had unprotected sex on the 30th and used levonelle 10 hours later (the next morning). three days later I experienced bleeding which was just like my period but not as heavy, with stomach cramps. It has only just stopped now, having had lasted 3 days. This is still worrying me, as I am scared that it's early signs of pregnancy, if the pill has not worked? I'm still getting cramp quite bad, please help!