Sluggish bowels anyone? (over 26 weeks pregnant)?

Does anyone else have a problem having bowel movements after 26 weeks? I have been going like a champ (sorry tmi), until recently when I hit the 25-26 week mark and now that the baby's bigger I have a harder time going, unless I drink a bit of coffee (which my doc. approved)....anyone else have this problem? I have lots of fiber, veggies and fruit, as well as water, so it is not dietary.