Worried all the time...

Hey everyone!! I'm 10 weeks pregnant. I have an 11 year old wonderful son! We got pregnant last sept but had to have a d&c October 14, 2013(a day I'll never forget) bc the heart stopped beating at 8 weeks. I haven't announced this pregnancy yet bc I did on Facebook last year then miscarried and everyone kept asking questions. We are soo happy about this pregnancy but how can I stop thinking that this ones not ok?? I go to md on Monday, like bc my breasts aren't sore anymore I feel