Ultrasound on Tuesday

I am 8 weeks today. We have an ultrasound on Tuesday, to check for the subchorionic hematoma and all of a sudden I'm just terrified. My deepest fear is that they are going to tell me that the baby doesn't have a heartbeat anymore and that I am having a miscarriage. This is my 2nd pregnancy, and my first one ended in miscarriage at just over 5 weeks. I have had a serious headache and some stabbing pains in my uterus. I have no idea if this is normal. I had resolved to myself not to worry, but here we are. I guess I could use a few prayers if you have any. ❤