Faint positive pregnancy test. but period 9 days early. why would i be bleeding?

Get it checked out.: You might have this due to many reasons. The test kit can be too old and the reagents expired, it might be done wrong, and many others. You might have had an early miscarriage and not all tissue passed out, or there might be/have been a germ cell rumor there. You might even have the start of an ectopic pregnancy, a potential emergency. You must see your doctor to find out and clear this out/up.