Feeling sick

Been feeling sick all day like I been wanting to puke..lower back hurts, boobs hurt and a headache..since I haven't got my AF for Oct yet which is one more day left in his month I don't know if I might be pregnant or AF coming cause this never happened to me before..took another test tonight which came up neg again which is making no since to me and I'm 9 days late!!!can anybody help me to understand what is going on?