How do i no if its morning sickness,...hellppppp?

i think i may be around 2 weeks preg i have been getting morning sickness like gassy about to spew/burp and cannot stomach certain foods etc plus been craving peanut butter and cheeseburgers and other weird foods. i may wake up and feel this sickness to and i threw up just saliva the other day plus i havent been getting hungry only at night time and dnt want anything sweet. just foods usually toast or cheese etc. my nipples have gotten sore and a lil darker and iv been getting pains not due for period yet and took a test said neg but i just hav a gut feeling im preg and so many ppl hav this gut feeling i am too what do u think