When I had my mc last year I went through something so emotional and I was physically and mentally a wreck. I thought that caused my mc. I was assured by both the ob at the hospital and my own ob that while not ideal this didn't cause my mc. I know that little voice in your head.
I know it's so hard, can you do something that you find enjoyable that can take your mind into a more positive frame? Spotting is so common, I think in my bellybuddies group we nearly all had some between 5 weeks and 12 weeks.
Crossing everything for you x