Stressing

I can NOT shake the feeling or get excited for this pregnancy. 12 weeks today, and I have an ultrasound Saturday to see baby again. I just am so scared something is going to go wrong I don't want to get attached. I've never had a MC or anything I just can't shake it, and I've never had spotting or ANY MC signs. I don't really think I have I'm just worried that my baby isn't okay. I don't know.

Is there anyone out there that feels the same? Or have any advice?