Worried all the time

I have a maternal heart condition that can be passed on in pregnancy. Most pregnancies where the baby has the condition end in a miscarriage in the first trimester due to the body seeing it as a not viable pregnancy. Because of this I have had about 50% of pregnancies end in miscarriage. I have 3 girls, but have lost 4 babies all in the first trimester. So of course I'm nervous and worried about having another miscarriage. Curious if any other ladies have this fear all the time, and if so how are you easing your fear?