I'm 14 years old and I just had my menarche last year. I've always had 3-5 day periods once a month. But this month, I'm already on my 9th day and it doesn't show any sign of stopping. I hope it would stop now because I have a swimming competition tomorrow and my period is interfering with my swimming practices. I have a balanced diet, I sleep for at least 8 hours a day, and I'm not stressed out or anything. What could be the cause? Am I sick? Please help!