Why am I so apprehensive?

b

I'm 8 weeks pregnant with my rainbow baby, I feel like this should be a much happier time than it has been. My mind keeps going back to February and replaying the worst news of my entire life "I'm sorry, your baby has no heartbeat and stopped developing at 8 weeks." I'm hoping for the best with this pregnancy but truly preparing for the worst. I just keep feeling like it's going to happen again or something. I question my body's every feeling. Does this feeling ever go away? Will I ever relax if this is a healthy pregnancy?