Scared

Is anyone else scared of having a miscarriage?? This is my 3rd pregnancy, but my last 2 ended in very early miscarriages. I'm only 4 weeks 3 days, but I'm already farther along than I ever have been. DH and I went through fertility treatments before we decided to stop and adopt. The next month we got pregnant! I have to believe in God's timing, but I still go back and forth between feeling overjoyed and anxious.