Is Light Brown Slimy Discharge With No Odor Signs Of Periods Coming ?

i am 18 years old && i have a light brown discharge, it is a little watery and kind of slimy with NO odor. i am supposed to be coming on my period today which is when the discharge started. i do have a few period symptoms such as sore boobs && a little cramping here && there.This has NEVER happened before. Iss my period coming?? Pregnancy??

ps. im sexually active