Constantly light headed & nausea?

Is it normal to constantly feel nauseous even while and after eating? I feel nauseous in the car, eating and pretty much all of the time. If I am not nauseous I am slightly dizzy/lightheaded. I’m my first pregnancy I experienced nausea but never to this degree! Ladies help me out with some advice or potential signs of what this could mean as I am only 5weeks +2 and already exhausted!