This might be the dumbest thread ever, but... I'm curious.
This is my second pregnancy (DS1 turns 2 in April), and, well, it feels like my uterus is flopping around inside of me. Or I guess, lolling around... Shifting around... I don't know.
During the night I tend to shift between sides, and when I roll over, I'll feel my uterus kind of sliiiiiiiiide slowly from the side I was just lying on, to the side that gravity is now pulling down. It's, I don't know, disconcerting. It will go all the way from one side, to the other. When I wake up in the morning, I usually roll off of my side, to my back, and check my email and my calendar for the day. And when my bladder is all full and I roll to my stomach like that, I can literally feel my uterus over by my hip bone there for a minute. And then it kind of slooooooowly settles into a more mid-lying place in my abdomen.
FWIW, I'm a fairly small person, about 120lbs before pregnancy. I don't think it's just simple abdominal weakness, because I've got some pretty strong abs (so strong, that when my midwife was checking my uterus, she commented on my strong ab muscles). And I know it's not the baby's movement, because this is not early movement type stuff (I'm getting little tickles... the baby is too small to make these sensations). But for second (or third, or fourth) time mamas, is the shifty feeling just something that comes with second time pregnancies? Is it just that my ligaments are more stretchy, or do my organs just shift to accommodate more easily, or what? Are you getting the shifties? My uterus definitely didn't shift around like this with DS1.