At my first antenatal class last night another mum to be mentioned that every time she sneezed she got a similar pain. The midwife used diagrams of the uterus to show how when we are pregnant one of the ligaments from the uterus to the wall of the abdomen is under much more pressure. So, when we turn too quickly or make a sudden movement (like a sneeze) we feel a sharp tugging pain. So, I imagine that the pain you are feeling is that. It's always a good idea to see the doctor though if you are concerned.