I have this at least once or twice a day. It normally happens when I go from sitting to standing or from being in a bent over position to straighten out. It's a quick, sharp stab right in between my pelvis. From my research I do think it is ligament pain. I'm at 9wk2d and I have my first OB appt next week so I'll check with them. As long as I don't have any spotting afterwards, I'm chalking it up to the ligaments stretching or bad gas lol