Just as Lovemykids said, there is the possibility that bub was just ready to do a wee When I had my 20 week scan with my first he had an enlarged bladder, but I was told to go away for half an hour & when they rescanned his bladder was normal size, so he it was just full & he was ready to wee. I imagine I would have been a basket case after 10 weeks, just that half an hour was enough to have me stressing out.