I just wanted to say that I had acupuncture (with electrodes) when I was pregnant with DD1 and it didn't work to bring on labour, neither did the bouncing on the fit ball.

I think your mind has a lot to do with it, so try to see if there is any reason why you think something could be blocking it - I put mine down to too much pressure with DD1 and then with DD2 I believe she was overdue because my fear of labour was stalling bringing it on - if that makes sense. If you read my birth story (link at bottom in my sig) then you will see that it took a mini meltdown and me to admit that I was scared for my body to react and actually DO something

Best of luck sweet!