Will Post-tummy Tuck Swelling Stretch my Skin Again?

Hi - I am a 27 year-old female who had a full tummy tuck 6 weeks ago. I am in great physical condition - in fact the dr. didn't need to do fat removal on me. Though my swelling has gone down, it's still present most of the time (mornings excepted)right below my belly button. I find that when I sit up or bend over, the skin seems to sag. I don't remember this being the case when I first saw my tummy the day after the surgery. Can the swelling cause sagging? And if so, will it tighten up again?