Loss of Symptoms at 9 weeks

Has anyone else experienced a reduction in the severity of their pregnancy symptoms in the 9th week? I felt nauseated from week 6-8 1/2 weeks but now I don't feel that bad anymore. My breasts haven't been very tender with this pregnancy, and I'm still very tired all the time, but I no longer feel nauseous. I'm worried because I've had three missed miscarriages in the past and I have an ultrasound tomorrow. I just feel certain this baby has died as well.