Nope, this isn't twinges. This is actual pain as if someone is taking a bone and spreading it apart. I should say that it isn't he actual bone that hurts, but more of the ligaments/muscles in that pubic bone area.

This is a normal feeling because when I talked to my nurse about it when i was pregnant with Caleb, she just said that the bones are preparing to stretch out for birth, and that I'll feel this from time to time.