My anxiety is through the roof.

Was in the hospital a few nights ago for gallstones, they did a ultrasound and I’m only 6 weeks so they said it was too early to see the baby/heartbeat. I’ve been crampy and low back pain since I found out I was pregnant (nothing too extreme.) yesterday I had light pink/brownish stretchy discharge and it freaked me out. My doctor said it’s probably from the transvaginal ultrasound at the hospital. my lower back still hurts, but I’ve had that since the beginning, even when I’m not pregnant my back hurts. My anxiety is making me worry I’m gonna have a miscarriage. What do y’all think?