Pregnancy after loss

So I am pregnant. This is my 3rd pregnancy, my first two ended in miscarriage at 9 and 5 weeks. I don't know how to be excited for this pregnancy instead of just scared.

After 12 months of trying and two losses I got heaps of blood tests done to try determine why I was

Miscarrying and the doctor said they can't see any reason why I would. So I am trying so hard to be hopeful. I wish there was a way of knowing for sure things were going to be okay.

How do you cope after loss?