So much anxiety

I have my first ultrasound appointment on Monday, I’ll be 7 weeks and 1 day. 4 years ago I had a MMC at 8.5 weeks. I had no idea until I went in at 10 weeks to have some testing done and they couldn’t find my baby’s heart beat. I am just a big ball of anxiety right now that I’m going to go in and the same thing is going to happen again. We haven’t told anyone about the pregnancy because we want to wait until I’m 12 weeks, so I don’t really have anyone to talk to about my worries. I can’t relax or sleep because my mind is just flooded with anxiety.