Yeah, it sucks when you don't get much of a reply.

I was just thinking this morning that the lovely chiro who I saw with my third pregnancy earlier this year, used to say that the ligaments from your pelvis attach to the uterus and sometimes they can pull more on one side, especially as the baby gets heavier etc. The pelvis is always trying to right itself, to keep you upright etc and that's when I used to feel quite a bit of pain in third tri. She was great at releasing this and making sure that everything was in alignment and moving well. Out of all three pregnancies, I had pelvic instability with the first two and I could barely walk by the end of the second pregnancy. Third time around, I saw the chiro and I didn't have the same pain and could walk well, throughout the pregnancy. She really loosened it up and baby was fully head down and engaged by the end of the pregnancy. Something that my boys never achieved!
So I'd say if you still notice it happening throughout your pregnancy, maybe get somebody who is experienced in working with pregnant mums to have a look.