Advice please!!!

I am 11 weeks today. I have never had any symptoms since I have been pregnant. I had a mc last year at 6 weeks. It is 2 weeks until I go to hear the heartbeat. I am so worried. I don't feel I'm getting bigger. I had an us at 7. Weeks and saw the heartbeat but I see a lot of where people see it but at 12 weeks they have miscarried with no signs.