Best pregnancy reveal to my husband

My husband & I have been together for 20 years. We have 6 kids right now & I took a pregnancy test yesterday & it came out positive this man can sneeze on me & I get pregnant. I am ecstatic, I've already told my daughters & they're excited but they want to do a huge reveal on Father's Day. how am I supposed to keep it from this man please note my oldest is 18 years old young man that just graduated out of high school. I have a 16 , 14 , 3 and 2 yr old girls , and a 3 month old boy. it's really hard for me to keep things from my husband I'm like a little kid I have to tell somebody how am I supposed to keep it from this man until Father's Day what am I going to do when he hands me a glass of wine or a margarita and he's very playful he likes to tickle & act like a child. So how can I keep him from straining me without telling him ... like youd think Id be a pro at this with 6 kids. What's the best reveal you've ever heard of, my girls came up with the idea of a T-shirt and putting the dates when we first started dating, the birth of each child, our 1st & 2nd wedding and at the very bottom add the due date for the the new baby. And I thought of getting the gift box with spaghetti noodles & Prego pasta sauce with some Dunkin Donuts munchkins and Dad's root beer