Pregnancy after Miscarriage: Im scared

In December 2018 at 12 weeks pregnant, I lost my son (my little bean). It was the most physical and mentally painful thing I've ever gone through.. I have spent the last 7 months recovering and bettering myself.

I found out on 7/14 I am expecting baby #2 and Im terrified!! Im due March 30th. My boyfriend and I are so happy to be pregnant again & he is SO SURE this baby will stick. Im skeptical. Im still so early but every little cramp or spot of blood makes my heart race.. Im trying not to stress out for the sake of my little peanut.. But oh man.. Im so scared.. Any advice from women who have had pregnancy after miscarriage??