What do you say when people ask if you are pregnant?

Lindsay
Before TTC I was a bit of a drinker. Wine with dinner and cocktails on weekends. Now that we are TTC I have majorly cut back, and I stop altogether during the TWW. The only problem is people immediately assume I am pregnant because I'm not drinking when we go out socially.
Last night I went to dinner with a large group of people and had someone say "OMG is that water, are you pregnant??? Congrats!!" Very loudly to the entire table. I had tested earlier that day and got a BFN. I almost started crying out of embarrassment. She wouldn't let it go and I finally asked her to stop. I was supposed to hang out with the same group again today, but I am too embarrassed and sent my husband by himself. 
So my question is, what should I have said to avoid this uncomfortable situation? 

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