How do I tell my parents???

Meg • 🍍
My husband and I recently found out we're 5w3d pregnant. We are over the moon and his dad and step-mom are too.
But my parents? I am TERRIFIED to tell them and I don't know why!!! I am their oldest and this will be their first grandchild. I want it to be special, but I am so anxious/nervous for their reaction. Any advice for how to break the news???