I had the same feeling that you did.. fizzies or something, and within the following week it became more prominent, but could have been mistaken for gas. Then, out of no where, it was obvious kicks and nudges, especially when I was laying down.
I started having BHC's one day and a few moments after they stopped, I actually felt the baby kick. Trust me, it's an undeniable feeling, and you won't question it, but right now, you MAY be feeling the baby, but it could also be gas.