I'm not pregnant right ?

I was three days late which I'm never am and had the worst cramps for two days  ! AF only lasted 4 days which my period is always 5-6 days . My boobs are not sore anymore but I still have backaches, headaches, light cramping/pressure, I'm light headed and my appetite is everywhere, I'll be hungry and once I start eating I don't feel like eating anymore. Spotting lightly brown blood but just saw a dot of red blood . Another weird thing is I'm VERY bloated which I'm never this bloated. 
I took a test the day my AF came and it was a BFN.  So I'm definitely not pregnant right ?? 
I'll take another test tm. I'm just confused why I feel this way. 

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