Early Pregnancy symptoms..

I don't know if I'm freaking out, or what. I've never been pregnant before. But I was wondering what were you super early symptoms? I'm talking week 1, 2, and 3. 
Well I don't know if I'm pregnant now. But if I am I would have conceived three weeks ago. I'm holding the most  I can for a test. (Ahhhh!)
My symptoms are: I want to pee ever hour or so, extreme heart burn for the first week and a half, my lower belly feels like if I would have done sit ups, and all I want to do is sleep (and I never ever take naps!) I might be overreacting!
No tender breast at all 
But what do you think? I might just be microanalytical everything lol