How to see a digital touch message again?

Today for the first time I got a digital touch message on my Apple Watch. Someone sent me a drawing with my name and his/her heartbeat. I don't have that person in my contacts so I don't know who sent it to me. I trying to retrieve the message again so that I can see the phone number of the person who sent me the digital touch message, but I don't know to to do it. Does any one how to do it?