Autumn- Fantastic news about your scan! Hearing the heartbeat is the best sound, isn't it?
WOP Baby movements can feel like gas, but that's a bit later on as far as I remember. The first movements really do feel like delicate flutters. What I remember from last time, is that I was unsure for a week or so if they were movements, and then I was sure. When I was pregnant with Delilah my placenta was right at the back, so I could feel, and see movement really early.