work shower etiquette advice

A coworker is expecting a few weeks before I am and so a few ladies are throwing a small shower for us. Super excited as my family and friend shower is in a couple weeks. Work shower is potluck style and so coworkers are bringing in a dish for us to celebrate our bundles of joy. Not sure how to approach the subject but 1. should I plan on bringing a dish as well (no one has mentioned it to me but I don't want to come empty handed. I don't have a problem bringing in a cheese tray or something) and 2. I was thinking about getting a small gift for the other mommy-to-be but I don't want to put her on the spot. She is also registered at a store that isn't in our area and so I don't want to get her something that she isn't registered for. I'm thinking about ordering her something and letting her know it's on the way. Any advice?