Seventeen and Possibly Pregnant?

Okay, here's the story.

My First day of my last period was the 4th of August
I was due for my period on the 2nd of September, it didn't come.
I have very tender nipples.
I had a metal taste in my mouth on the 4th of September.
I am exceptionally horny.
I am turned off certain foods that I normally love and crave for.
I feel nauseous every late afternoon/evening.
I have been a little more flatulent than regular.

I took a pregnancy test on the 26th of August and also on the 2nd of September, they both showed up negative.
I had blood collected this morning from the doctors to see if it shows up in my blood and am returning tomorrow for the results.

Could I be pregnant?