The problem with pineapple is that the compound that helps to induce(brolimein I think it's called) is only found in the core of the pineapple so you have to eat a lot in order to get enough of that for it to do anything. But I'm still trying, I ate half of a pineapple and am going to eat the other half tonight as well as try some other things to help progress in my dilation.
you also got to be close to your due date because if you are not 37 wks the dr will stop the contractions. good luck. i never liked pineapples enough to eat that many.