im 23 weeks with my second child, i had the same thing around that time. my doc said it was hiccups, it lasted for about 15 mins each time. it seems like a strange spasm or twitching but its cuz that cute little baby has hiccups!!!
maybe the baby is coughing? i had one yesterday, it was a little shake, i assumed that she coughed
Mine does it also,does sound like baby moving around.mine often does the mexican wave,right across tummy really quick.
Are you sure it's not the baby moving around?