How do I get over the fear of miscarriage?

Julie • Due beginning of October 2016
I have had 3 miscarriages - 2 before my beautiful now-4-year-old daughter, and one 2 years ago, and we've been TTC for 8 months. Finally got up the nerve to take a pregnancy test this morning, and got a BFP
Then had to take 2 more just to be sure it was real :) 
I should be over the moon excited, but I just feel so panicky and trying not to get attached - I feel like all my pregnancies will end in miscarriage now. How have you dealt with that fear? I just want to be excited about this!