5w3d pregnant

I am about 5w3d pregnant. I found out last week (one day after my missed period). Last year I had a miscarriage, but I also have a healthy 3 year old daughter. With this current pregnancy I knew I was pregnant before the test because of the symptoms. However, every day I am constantly making sure my breast are sore, and I get so paranoid if I'm not tired or having nausea, because my first sign of miscarriage last time was "losing my preg symptoms," I am so paranoid. I have a doctors appointment on May 6th (today is April 29th). Is there anything that I can get done to ensure the baby is still alive? And how often are there repeated miscarriages in my situation?