Vibration feeling!?!?

For the past week or so, im now 16+2 with twins, ive been having this abnormal and very uncomfortable vibrating feeling right above my vagina... It seriously feels like my ceel phone, im constantly checking and nothing!! Ive googled this and many women also have experienced it but can not pinpoint was it is... Its quick lasting only seconds with a couple of mins in between... Its just bothersome and worrysome at the same time... I do feel them(popcorn popping) but this is much much different and lower... Should i be worried?