I feel pregnant but not sure

G • TTC 🌸
I was 8 days before my period a few days ago and I took a pregnancy test and it was negative. Very early to test though I know. 
Anyway, I've had tender breasts for over a week now and a few days ago, I ate something I usually eat and instantly felt sick. I've had back pain and my calf muscles really hurt but I put that down to sleeping weird as the pain has faded now. I've also had very minor twinges in my abdomen today and about an hour ago I came over feeling really sick and hot. Has any of this happened to anyone else?