I have noticed my belly looks lower (further from my boobs), too. My doctor said her head is down and it's at a +2 station, so she's not low enough to come out just yet. Not long now, though! :-)
My stomach seems to be a bit further away from my boobs a couple of weeks ago. Had a scan 2 days ago and the head has engaged dpi guess this means he is ready. Doc said it still could be another 4 weeks but can't guess since all babies come at different times when they are ready.