I am throwing up everything...PLEASE HELP!! Should I go to the doctors tonight??

Everything i am eatting/drinking i throw up, water, crackers make me gag, ginger ale, sprite, banna, gummie bears, mints, tea AND i'm not even on prenatal vitamins yet. I have an ultrasound thursday, i just started work at a hospital today and have a week and a half or orientation I am going to call in tomorrow and quit because this is too much for me!! Any advise??