I Am A Heroin Addict IV User And I Found

I am a heroin addict IV user and I found a full syringe I must have forgotten about in my purse it has blood in it but was not coagulated yet I have no idea how long it was hidden for a couple of days is my guess well I injected it pretty stupid I know and now I'm experiencing flu like symptoms chills and my whole body aches and feels really sore slight headache as well what did I do to myself and is it life threatening