TMI Discharge

So I am a day late for my period (woohoo) and for the past few days I have had so much creamy/egg white (consistency is egg white but it is creamy in colour) discharge which I NEVER get leading up to my period? any clues as to what this could be? I know I'm only one day late but I have had no signs of aunt flo rearing her ugly head but have felt nauseous and have had stretching pains in my pelvis/stomach area? Sorry for the long post! thank you all in advance