Need help!

So I just found out I was pregnant last week. I am at 5 weeks today. I am going out of town this weekend to a family wedding (in laws) and I am not ready to tell anyone we are pregnant yet. I am nervous that people are going to notice me not drinking and why and if I am pregnant. I am really bad at lying. Any tips or tricks to get around this inevitable question? Ways to make it look like I am drinking without actually drinking?

Right now my only idea is to say that we are trying to get healthy and in shape for our vacation to Hawaii in early October. But I feel like people are going to see right through that.