My last period was on July 5th for 6 days. I have then since last week had intense symptoms of pregnancy. Cravings, back aches, tender breasts, mood swings, etc...and I "feel it", as if I know I'm pregnant, but I just took a pregnancy test and it came back negative. Is it too early for me to tell with the test? And if so, when would it be best to do a test. And why am I feeling these symptoms if it's too early?