I need cute ideas!

I am 6w 4d currently. We are going on vacation with my family this weekend and since we will be together for a week we want to tell them rather than try to keep up with lies about why I'm not drinking and nauseous ALL day! I am looking for cute ways to tell them. This is our first, but My older sister already has children so nothing that says grandpa or grandma really works for it. I wanted to do something that said "make room for another family member Feb 2019" but when/where how! Has to be something I can order or accomplish by Saturday! Thanks for all the help!! Picture Below is how I told me hubby!