Any positive advice/vibes to help my anxiety

I’m trying so hard not to stress. 4 weeks 4 days pregnant, a few miscarriages, lower back pain and some cramping, on progesterone suppositories. I’m freaking out with every little aches. My pregnancy test was a dye stealer 2 days ago and I haven’t tested since. I go in for an ultrasound next week being over 35 and prior miscarriages. Is this normal for the back aches and sharp pain/cramping? I guess I associate the back pain with my period. But how would I even know if I were to have a miscarriage if I’m on progesterone which stops you from bleeding. I’m hopefully thinking wayyyyy too much.