Excuses for not drinking...

ILoveRedVino

H and I are going on a planned trip with friends this weekend.  It has been planned for a while, and these are friends from college who are now all over the country.  Some are close friends, others are not.  I'll be 5 weeks pregnant.

So... since it is a friends-vacation, it'll be really weird to not be drinking.  Aside from not feeling well, are there any other excuses you can think of?  I can always say that I gave up drinking, but then I sound like an alcoholic. 

OH!  And we specifically planned this trip for Cinco de Mayo so we could have a big fiesta, aka margaritas.

TIA!