Can’t help but to be worried

I am 7-8 weeks pregnant. I started experiencing morning sickness/nausea in my 6th week. Now into my 7th, I barely feel nauseous. I know symptoms come and go but I’m also experiencing cramping (no bleeding). I also have been diagnosed with a small subchorionic hemorrhage. I have had a miscarriage in the past so I’m freaking out. I have an ultrasound in a week and I’m terrified to hear that there no longer is a heart beat. It feels impossible to stay calm and stress free 😩