disappearing symptoms??

Jennifer
Anyone else like me? I'm about 9 weeks. I was occasionally nauseous and had tender boobs that felt really heavy. Now I feel neither of those. Other than constipation I feel completly fine. I go for an ultrasound on Tuesday and I am freaking out. Has anyone else experienced this and everything was ok?
I'm just worried the ultrasound will show no heart beat or an empty sac