I went to L & D at 36 weeks with regular contractions, and I really wanted my son to stay in there at least two weeks longer, preferrably 3. My oldest was a 37 weeker and while technically term, he had a tougher infancy than my daughter, who arrived later. So I asked them to do everything they could to stop labor. I got three shots, which stopped contractions, and my OB put me on bedrest (modified.)
Whenever I did get up and walk around more than I was supposed to, I immediately got painful contractions that would increase in frequency. So, I really did stay off my feet till the end, and my son arrived on his scheduled date.
Just my personal experience with it.
Boy (4/03) -- Girl (12/05) -- Boy (11/10)