Has anyone ever been told they were pregnant by a passerby?

I was on vacation with my family. We were strolling along looking at the mountains and an elderly lady came up to me and told me congratulations and i looked at her completely puzzled... she said "your pregnancy.. by the way your carrying yourself your pregnant." 6days later im at the doctor finding out im 7weeks along.. has anyone ever heard of this happening or experienced it? I cant stop thinking about that encounter...