Ok at my 28 week scan i was told baby was in oblique breech? Now i get this tightening sensation in my tummy then you can actually see the belly moving, its like a mini mexican wave (only way i can desribe it) and goes from one side to other i.e. left to right across belly button. Its really weird, and i feel the tighening first the the movement. Whats going on ? is this normal?