I have always had a light period lasting 3 to 4 days long. I have had mild cramps and moderate flow. This month my period is going on 2 weeks with cramping, What would be causing this?

Have you switched your birth control recently, or just adjusting to a new one? A change in hormones could cause it...
Have you ever had vaginal cysts before? They are mostly harmless and most women get them throughout their life (that info is from my gynecologist) but depending on the location they appear can sometimes affect your period! Your delicate insides are something I wouldn't take a risk with, get to your doc asap if this doesn't stop soon or any of the cramping gets worse!