Jumpstart Labor

I'm 37w3d and for the last two weeks I've been having contractions. They are irregular and some are intense and some are mild. At this point I'm now dilated 3.5 and effaced 80%. There is also a chance that this baby will be quite large so I'm trying to get things moving so baby will be able to come out safely. I'm drinking red raspberry leaf tea, taking primrose oil orally (would rather not do vaginally) and sitting on a yoga ball when I can. Other than sex, what else can I do?