Nervous momma

This is me and my fiance's second pregnancy. The first one ended terribly with a miscarriage at almost 18 weeks in November. We are super excited that we are pregnant again, however I am nervous. The first time I thought that once we got past the first trimester that we would be good, but we weren't. And now I can help but wonder and worry Whats going to happen...any ideas as how to cope. I know worrying will make things worse. Just don't want to go through that heart break again.