Random people touching your belly...

Vanessa
Today, I had a patient out of nowhere touch my belly. He said, "I hope you know it's a girl." I had absolutely nothing to say, because I was so shocked. I'm 10 1/2 weeks and didn't mention anything about being pregnant. If anything, I was embarrassed. It's early still, and my god! It's uncomfortable! I don't want random people touching me! 
Any suggestions on how to deal with people touching your belly? Has anyone had any experiences like this?