It was definitely a sign of me not being ready to have my own baby, and I think that's ok. I clearly remember at one of my friends college graduation parties a friend of our exclaimed (during the middle of a beer pong game) - "I don't want to get pregnant - I can't imagine NOT drinking for NINE MONTHS!"
I guess there comes a point in your life (or for some, maybe not) when you start thinking past the drinking implications of having a baby and plunge right in. But being pregnant doesn't really mean that you have to stop drinking, does it?