Is it normal for symptoms to fade and come back?

I'm going to be 9 weeks tomorrow and this past week it seems like my symptoms have sort of calmed down. I never had a lot of symptoms to begin with, just sensitive to smells and extremely sore breasts. Sometimes I wake up and the soreness in my breasts are gone and the pain will occasionally come back, but not nearly as bad in the beginning. I'm even doing better with smells and feeling more like myself. Sometimes I wonder if I am even pregnant! Is this normal? It worries me  and I'm still waiting on an ultrasound.