Opinions if AF or early signs of pregnancy:

Ive taken the time to write down my last month or so abnormalities. I never miss AF and for the past 3 years ive never weighed more then 98 pounds and no less then 91 pounds. I recently weigh 101 pounds (last week when I weighed myself) and ive been bloated since june 24th. And now im 4 days late with light cramping, mostly on my left side where I felt the sharp pains on June 24th. Ive taken tests all negative. I used first response early tests that are supposed to be used for 6 days before your af is due. I'm confused. Any help/opinions would be appreciated.