Exams today, my 2nd exam teacher wouldn’t let me use the restroom for this emergency, (I could feel leakage through tampon,)

Note: Put tampon in around 610AM, bled through it around 740AM.

Wiped twice - both times heavy amounts of blood + clots came out. My periods haven’t been this heavy in a few years (I’m 16, been on birth control for about a year which slows down MY rate of flow)

I set up a doctors appointment for Thursday but I’m anxious to know what might be going on.