Pregnancy nausea

With my first child I was nauseous from week 10-12. I'm currently 8 weeks& 4 days I've had off and on nausea it never past all day and only time I really get it is if I'm eating certain food or if I'm not home is that weird? I haven't been nauseous in a few days and it's scary but I do have an appointment tomorrow for an ultrasound.