I'm no expert, but my opinion is the baby is getting ready to greet the world so she/he is laying down low, and putting alot of pain on you pelvis. Or pinching a nerve which could cause the sharp pain. With my first, this happened about a month before labour and would accur on and off. If you walking or on you feet for a while, the baby is obvisiously going to put more pressure on you pelvis, but i'm just about due and I get those types of pains walking to the bathroom from the couch. Yep, it bites. But after your baby comes, no more pain, something good to look forward too. And the fact the you baby is going to be here soon, it's worth all the pain. But if you are concerned, maybe you should call you Doc. But I was told not to worry else I start seeing dark red or bright red blood...