Pregnancy nausea vs the flu?

I'm trying to figure out if what I'm dealing with is pregnancy nausea or possibly a flu as well. I'm about 6 weeks along and I'm just miserable. I've thrown up twice today and when I wasn't throwing up I was laying on my back feeling absolutely nauseas and miserable. I have absolutely no appetite and the thought of eating anything or even just drinking water makes me sick. Have any of you ever experienced anything like this with your pregnancy sickness or is it more than just that?