I'm scared

I just got a positive pregnancy test yesterday. Got it pretty early (about 3 days before my missed period). I always get myself worked up and scared about miscarriage because I have had 1 miscarriage and 1 stillbirth in the past. Can anybody give me some peace of mind, that this baby will make it. I know nobody will obviously be able to tell me if my pregnancy will go through..I just get so worried..what helped calm your fears in early pregnancy?