How far on are you? Could be early signs of spd. It does not cause any harm to the baby but can be quite painful for you, its where the pelvis over relaxes and the ligaments soften too much. I suffered with it in my last pregnancy, it was a bit of a pain but we got there in the end. Or like Tara said, it could just be wind. Best to get it checked out though x.

There is a thread on here calles SPD, if you have any questions about it you can always pop on there, there is a few of us that have either suffered or are suffering with it and we would be happy to help with any questions that you might have.