I'm not a professional but I am on my second pregnancy, so I'll just give you my opinion. There is this thing called round ligament pain. It sounds a lot like what you are describing. It comes at random times like when you move too quick or cough or sneeze. It feels like a super sharp pain for a few moments and then gets better. I have it like no other. Last night actually I woke up to roll over and it hurt so bad I thought I was going to cry. Anyway, look it up and see if it sounds like what's happening to you.