first pregnancy - scared to eat the wrong thing

I just found out I'm pregnant (5w3d) and I have a big fear of eating the wrong thing! My first appointment isn't until 8 weeks which feels like forever away!! My mom told me I need to stop worring so much and just stay away from the main things like raw or uncooked fish. Any advice?? Calming words from other moms who have done this before?? lol it's scary when it's your very first pregnancy!