Last night I had a strange sensation! It was like a vibration under my belly button to the left (quite low down) and it made me want to wee. I got up to pee about 6 times before I finally got to sleep. It was like a jumpy vibration pushing on something. Can't think of another way to describe it. Could it be bub or something else? This is my first so I'm still getting used to all the twinges etc. I'm 21 wks tomorrow.