Trying to hide

I'm a teacher and thought it was lucky to get my positive at the end of the school year ... But now all the end of the year parties and activities are popping up... Many which include drinks ... I got past one by filling a cleaned out beer can with soda but this is definitely a struggle... Me without a drink in my hand would be a dead give away that I was prego to anyone that knows me lol ... Any tricks to share ?