Constant Worry

I'm 4 weeks and 6 days today. I go to the Doctor Thursday to check things out. I had a MC in March of this year at 9 weeks. Does anyone else have a hard time letting themselves get excited this go around? I'm so scared to get excited or feel like this is real. I want this baby so bad but I'm still heartbroken over losing my last baby and I'm scared it will happen again. I know it's in God's hand, but I'm terrified.