hi.. i am 30 weeks and 5 days pregnant and for the past few days/week i have felt as though the baby is shaking rapidly or like a vibrating movement like a twinge.. it last a few seconds and goes. it's getting me really worried now, but in-between baby has been kicking. has anyone else experienced this or know what it could be?.. any advice would be great, i've obviously googled it and it's one extreme to the other harmless or go into a&e. i don't know if it's hiccups or not as i don't know what they also feel like. thanks