Are there any women that are intune with there bodies out there?

Ok, I think that Im pregnant..i'm driving myself crazy trying to find signs online of early pregnancy, but cant find the answers i seek. I think i'm about 3 weeks pregnant..and this would be my first baby! I have subtle signs but signs none the less that are not normal for my body... Me and my bf had right after my period and a week later I started feeling bloated and like my stomach muscles were stretching, then the 2nd week my period arrives extremely early and it lasts for about 3 days, (i'm usually a 5-7 dayer), Currently i'm feeling bloated still, very very irritable and cranky, I feel muscle spasms in the lining of my stomach, I smell EVERYTHING and I mean EVERYTHING! Certain things I would normally eat and drink taste funny to me now there not very good or have a tainted taste to them, and around my belly on is very tender and feels like its being pulled from the inside. My breats feel full and swoll but arent sore, and my bra is starting to feel tight, I get hot all the time and feel like I need air or a cool breeze to feel better. I have back pain and a shooting pain down my sciatic nerve. And i'm a big girl, but I honestly feel fat! I feel like my stomach is sitting waaay out in front of me! And I've been sleeping alot more and eating sweets alot more.. And I just want some answers from some women that are really intune with there bodies and have had children.. I could sure use some advice..