Nipple stimulation might help you, either just for the fun of it or to express some milk for your freezer for when bub arrives. Also if you have any clary sage oil in the house then pop a few drops in some milk, put it in the bath and have a long soak. Clary sage is also good if you put one or two drops in some almond or olive oil and massage your belly in a clockwise circle.

Good luck! I hope you labour on your own