It's totally normal to worry, but you are doing great so far, and the risk of miscarriage drops significantly after your 12th week, so try to relax and enjoy your pregnancy!
I'm sorry for your losses, I can totally relate. I lost twins and another before getting pregnant with this little one. But.....IT'S GREAT THAT YOU MADE IT THUS FAR!!!! Just relax and go with the flow of things. I was super nervous before too, and I'm a FTM so I have NO IDEA whats suppose to be normal and whats not (as to why I jump on here often). I even had a scare around 9 weeks with this but after I hit my 12 to 13 week mark, I calmed down a lot. Good luck hun and congrats : )