Afraid to be happy.

A few years ago I had a miscarriage. I didn't have any signs or symptoms and didn't know until I went in for my 10 week appt and there was no heartbeat. I am 8 weeks today and my fiancé is over the moon excited, and I am terrified. We have our first appt tomorrow and I am terrified. I don't want to think about the baby, I don't want to talk about it, we haven't told anyone. I'm so afraid of getting excited and attached and then going through another miscarriage. When will these feelings go away? I want to be excited and happy, but I just can't- I'm to scared....