How far are you from the hospital, and how long would it take your DH to come get you and take you to the hospital? I wouldn't do anything to promote labor at this point, unless you can get to the hospital pronto.
DH works down the street, so it wouldn't take him long. We're maybe 5-10 mins from the hospital. If I headed into the mall to walk, I'd be closer to the hospital, further from DH...but I'm honestly this is not really something I'm worried about...I'm going to go into labor at some point whether or not I do anything to promote it, and won't have any control over whether DH is around or not.