Should I go to the doctor?

I usually dont go when I'm sick but now that I'm pregnant I'm not sure. I am incredibly nauseous which I'm sure has to do with the baby. But I also am getting chills and bot flashes and I have terrible diarrhea. I am not eating much and I know I am getting dehydrated (with my first boy I was in the hospital 3 times for an IV because of dehydration)

I'm only around 7 weeks though so I'm not sure if it will have much of an affect. What should I do? Go to a med check? Or leave it alone.