Constant worry😢

So....! I have my OB appointment tomorrow morning. And I'm dreading it. I'm so terrified of been told something is wrong. I'm 18w 5d today. Does this fear ever go away? I'm jealous of all the excited people, the ones who are loving every minute of their pregnancies. I wish I could sit back and enjoy it, considering I have very little morning sickness, next to none really. All I have is mood swings and tiredness. I just want to be happy. I want this baby so much it hurts. But I'm so afraid to let myself be happy. 😢