pregnancy is so scary

This is my first baby and after almost 5 years of trying I thought for sure I would be so happy and excited and while I am both things I am more scared than anything. No one warned me about it being so scary. Every time I ache or anything I get so scared that I'm doing something wrong or the baby won't be okay. It's just making my nerves and my husbands off the wall. Anyone have advice to make it less scary