Had an ultrasound yesterday and the placentas are anterior so I probably won't feel regular moving for a couple of weeks. The twins are higher of course; my fundus is just under my belly button with a full bladder, a little lower without. They are stacked one laying on top of the other (when standing). Occasionally I feel what I'm pretty sure is movement, but it is few and far between. What I've felt has been a quick series of taps followed by nothing. 13w4d today.