Since the pain moves around, the only thing I can think of is round ligament pain. Which isn't anything incredibly serious, just the feeling from your ligaments stretching as they grow to accomodate your uterus. With my first pregnancy, mine got to be pretty painful in my 2nd trimester. You might try googling it to see if the symptoms fit what you're going through. Aside from that I'm not really sure. If it continues to be persistent, I'd probably mention it to my Dr. HTH.