so question for you ladies

A little over a week ago i had what i thought was my period. The first day was very light pink mucus the second day was spotting the third day seemed normal and the fourth day it was back to very light pink mucus. Well today a little over a week later I was (excuse me if you get grossed out) masturbating with a toy and noticed very light brown discharge and i do mean very light it was hardly noticeable. The past few days I have been feeling nauseous and dizzy at times. And my nipples have been hurting since right after I thought I had my period. What do you think this could be?