TTC secret

Hey ladies! If you're TTC and keeping it a secret, what do you say to people when they question you not drinking? I like in Canada and it's a long weekend this weekend (woot woot) but I won't be drinking. I rarely ever drink since having my son (3.5 years ago). Sadly I know people will try and get me to. I can already tell this is going to be a long summer! I don't go many places without my son, but I already know we'll be going away for a baby free weekend with some friends and I'm okay having one or two drinks but not really any more-and I know they'll want shots.