Pregnancy after miscarriage

Am

I lost a pregnancy at 12 weeks in 2019. I just got a positive test and I’m a wreck🥺🥺 I’m so scared about another miscarriage! Every little pain I worry and I only just found out. I’m happy but I’m trying not to be too happy. I’m trying not to let my fear consume me or stress me. My doctor wants me to come in and have blood work done this week just because I had that miscarriage and that makes me nervous too😫😫 I’ve been taking tests every time I go to the bathroom for the last two days. How did you calm down when you got your rainbow?! How do you not worry?