This was my nightmare at eight months pregnant last time around. I dread that it will happen again. Although I can only share my sympathy, you may want to consider any supplements/vitamins you are taking. I realized in month 8 that it was the prenatal vitamins, which had lots of iron in them, that was constipating me terribly. I switched to taking 1 every 3-4 days instead and the problem really dissapated. Not one's favorite thing to hear, hey stop taking your vitamins, but perhaps worth a look.