If I remember right from my last pregnancy, I got those pains too, when baby moved near the end. Seems like a nerve or a sensitive section of your body is pinched as the baby's head is moving down. I don't think it means anything serious, or worrisome (although, by all means check with your OB if you are concerned!). I think it means that baby's head is moving farther down in your pelvis, which is a good thing! Hang in there - you'll be done with this soon.