I occassionally get the same thing on my left side just under my boob. I will be interested to see what others say because I'm not sure that it is kicking - I get kicks down and above my belly button but this feels different - it is literally a spasm.

I have been getting very sore ribs and high in the back - especially if I sleep with too many pillows or sit in the same spot for very long. I thought that maybe the twitching had something to do with that and the changes in muscle and skin. I havent been worried about it though but seeing as you saked the question I'll have to keep an eye on peoples thoughts