Baby girl has the hiccups!

So I'm sitting at my desk at work and feel what I think are gas bubbles. This goes on about 5 minutes before I realize they are perfectly timed apart and in the same spot. I stand up and push on that part of my belly and can feel it from the outside! It dawns on me she has the hiccups! They went on about 7 minutes in total and my coworkers came over to feel it. It was very exciting and I wish dh coulda felt it. I'm 21 weeks 3 days along. Anyone else felt this yet? Would you describe it as a pulse sort of feeling/gas bubble/tapping feeling?