'I can't drink' excuses HELP!

Carly
Ive just got my BFP I am 2-3 pregnant.  As it is summer, I have a number of parties, BBQ, weddings and meals out, everyone will know straight away that something is up if I don't drink (I always have a tipple) I will only be 6-7 weeks pregnant by then and don't want to tell until 12 weeks ...
​Does anyone have any good excuses? Like 'I'm on antibiotics'