Scams? 25/10 - 06

I got a little paranoid today when three girls started to talk to me on the street. At first they sounded really nice. They said they were art students from Beeijing and asked me lots of wquestions. The suspect part was when they wanted to show me their work and they wnated me to follow them to an alley. Knowing what I carry in my pockets I don't wanna lose I said that I didn't have the time and they got really persistent wanted me to come along for only 2 minutes and suddenly they were only staying in Shanghai for one day instead of the whole week at they started out telling me. But then agin.. could just be me...