Christmas party!!!!!

Joyce
So I have just found out that I am 5 weeks pregnant woop but my works Christmas party is on the 9th of December which I have been very excited about and have told people how I am planning on getting rather drunk 😂 
Obviously now I will no longer be able to drink but I'm not quite ready for people at work to be aware... any tips of hiding the fact that I can no longer drink ... excuses or something pretty please 
Ps: all drinks are free so I can't use the excuse of I have no money