2 Weeks Long!

my period is always 7 days long and if it is longer it's only very light spotting for another day. This cycle I started on April 18 and it's currently May 1. For the first 7 days it was a normal period. The flow was always like it was. I woke up the next day and I was still bleeding. Ever since then it's been slightly light. It's been really gooey and clots. I'm freaking out and crying because I don't know what's wrong with me. I told my mom and she's making an appointment but I just want to know asap. does anyone know what this could be/mean?