I know this sounds totally nuts :o
But does anyone else's baby almost seem to feel like they are tugging on you from inside? I've had this right from about 14 weeks, am 23 weeks now and it's still happening, if anything it's stronger now.
It's usually when I bend or move quickly and it's almost like when you walk past a door handle and your pocket gets stuck on it and pulls you back, that kind of sensation, but from inside me!
It's totally weird. And then today I was running my fingers up and down my bump and my baby did a massive kind of shiver/weird same kind of internal elastic band twang thing and it felt so weird I let out a kind of yelp and DH and DS2 came to see if I was OK 
I think I remember this happening in my other pregnancies but this one seems to do it loads 
Just wondered if it was something other people experienced or not - it's hard to put into words so tricky to search.