Hiding a pregnancy while attending bachelorette a

Kyla
I need advice! I JUST found out I am pregnant and I have a bachelorette party to go to in 2 weeks. I know the plan is pretty much drinking games for an afternoon (not my forte to begin with). I need some tips on what to do to avoid getting found out!
So far I am thinking of drinking non-alcoholic wine (might have to switch bottles). I am also going to bring a cup that you can't see through so I can pour whatever and if someone pours in my drink they can't see how much I drank until I find a moment to throw it out. 
Any or else been through this???