I need advice

Beth • Due 12-13-15. Had a mc last year super nervous. Hoping this will be my miracle baby.
I am currently almost 10 weeks pregnant. I had a miscarriage at 6 weeks in October. I can't quit freaking out. I do not have many symptoms. I had an us at 7 weeks and saw the heartbeat they said I wouldn't do the Doppler until 12. I am worrying myself crazy. I don't know what to do I am scared it will happen again