Love all the funny suggestions - this is just my story RE babies, body and booze:

I've been tee-total for a couple of years now, started as a pre-conception health-kick and the idea of alcohol just doesn't interest me anymore. Guess I was lucky in that I could say "I don't drink anymore and I'm not pregnant, so don't get any ideas" and now it's been so long that no one thinks anything of it.

I think it's easier if you don't drink at all rather than 2 weeks out of 4, then people get used to you not drinking and it's not an issue any more.

After all, people who try and force drinkies on you are drug pushers (but it does seem to upset people when you point this out to them)!