Scared Sh*tless!

I just found out yesterday that I am pregnant... Dont get me wrong I am very very very excited But a lot of me is terrified!! All these what if's? keep popping in my head and i'm just so scared. I dont know what to do. I am trying to be as calm as I can because I know stress is very bad for the baby. I just cant stop all these questions and nightmares. Please pray for me and if u have any advice that would be cool too. I just am scattered brained right now....