Confused about early pregnancy symptoms

I just KNOW I'm pregnant- I have every symptom in the book! Haven't missed my period yet and have gotten 2 negative tests (it's just so early but I can't stop myself lol)! I guess I'm confused on how I could have every symptom but still a neg? I'm sure my Dr. will explain it next week but for now I'm just confused and anxious! Any words of wisdom?