Mia,
i am 11 weeks!! I too am skinny, but have recently lost my hips and my belly is starting to look noticeable. The only good thing is I work with 15 men, and thankfully they are not so observant.
I am having the same popping and fluttering sensations so it must be the baby as we can't both be having the same thing.
I have my 12 week scan booked in on the 4 nov so can't wait to finally see my baby!!! So excited. :d