i had the same thing before my last check up and then when checking baby's heart beat.. we couldn't hear it properly because the little bugger was moving around so much and thats all we could hear on the dopler thingy..... but i couldn't feel it.. we eventually got to hear the heart beat and everything was fine... i guess its jut one of those things.. but if you are at all concerned then definately contact your hospital.. thats what they are there for.