I had that from mid second tri until the day my son was born. My hips have always been relatively small and didn't widen noticeably for birth, in terms of measurements.. I always just attributed the pain to the extra weight I was carrying around! Especially when I started sleeping on my side. Just my experience though! I've only been pregnant once, after I gave birth to my son- the pain stopped so I just assumed it was because the pressure was alleviated.
Re: Hip pain?