G.O.
Sounds to me like you are experiencing pressure from the sciatic nerves. Your nerves actually connect at the back of your hip bones, and run down into your thighs, and to your upper back. As baby descends, she's really putting the pressure on these nerves. For discomfort stemming from your pubic area (this is common in these cases), again as the baby's head descends, your bones are going to shift slightly. If you are sitting or standing in an upright position for long periods of time, this can worsen the feeling. As I tell all of my clients, you should look into visiting with a Maternity Chiropractor. You'd be surprised by the wonders they can work with these kinds of pains!
Best of luck to you, and remember the beautiful reward you'll be receiving soon. There is a light at the end of this tunnel. lol :)
G.
Dallas Doula