Worried

I'm so happy to be expecting again! I had a miscarriage a year ago (feb 2) I have a 2 year old little girl. Im around 5 weeks right now and I am so worried about having another miscarriage it's all I think about :-( I don't have a lot of symptoms just some motion sickness when I drive and my boobs were a little sore but that could've been because I was weaning my 2 year old. I can't wait til I can go to the doctor