Nervous but Excited

I had a miscarriage in November. I was supposed to go in for my 9 week ultrasound when I started spotting. The ultrasound showed my pregnancy wasn't viable as my baby stopped growing at 6 weeks. I had a D&C; and was a mess as most who've been through this can relate.. today I got a BFP but I'm so scared. This first trimester is going to be filled with anxiety until I get past it and am told everything looks good. For those with rainbow baby's or pregnant with their rainbow baby... how did you deal with the fear of it happening again?