I remember with DS1 that he had this really quiet period for well over a day. I was about 29wks and still working and when I got home I realised I hadn't felt him move in all that time and of course I freaked out but as soon as they put the paddle for the u/s on my belly he started moving. Apparently he was just having some quiet time in there and lots of sleep cycles. I think you have to listen to your gut, pardon the pun LOL, but yeah, I don't think you are being paranoid.