Does this sound normal?

I eat off and on through out the day and drink lots of fluids. My stomach is still nauseous after I eat or snack. I'm 6 weeks! I don't even know when I eat if I'm getting full because of the nauseous feeling in the stomach. This is my first pregnancy and all I eat is pretzels and crackers. I really don't eat real food like salads, cheeseburgers, and etc. Every time I hear someone mention food, it makes me wanna puke but I don't ever puke. I just hope this feeling is normal and I want to enjoy Christmas without feeling so nauseous!