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.
I'm not sure considering I'm only 7 weeks along but someone posted the other day and a lot of responses were like 5-7 hole pineapples that you really actually have to eat a lot of them.
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.