Oh the lies!!!

Je
So every year my uncle takes the whole fam out to a fancy dinner. No expense is spared. Of course in years past I have partaken in trying some of the special drinks these restaurants specialized in. I've also never been shy about my love of alcohol
​So this is coming up and now we are TTC and NO ONE knows. How the heck am I gonna hide my new no alcohol rule with the whole fam sitting there.
​This dinner occurs four days before AF is due to rear her ugly head. I know I can test but I'm worried about a false negative. 
​Thoughts? Ps having a drink is not an option so please don't suggest that. 
​Thanks! :)