What Causes Increased Appetite,sore Breast And Cramping In The Stomach?

hi, for the last week or so, ive been having some pregnancy like symptoms, increased appetite, periods of becoming light headed when getting up too quickly, sore breasts, slight nausea. Im not due on my period until next week, so ive waited to take a pregnancy test, yesterday i came on my period a week earlier, ive never come on my period early, the colour of the blood is off, its more like a pinky discharge/ wartery, but enough of it too warrent a pad. im just wondering what the hell is going on, this isnt like a normal period, im getting more intense cramping, but more localised, and much more of a sharp pain than usual. what would be your advise ?