Aiyoh, at 25 weeks the upper abdomen pain boleh jadi ligament stretching or sometimes baby's position causing discomfort, good thing doctor dah check and gave you the all-clear, so at least nothing serious! A few mummy friends I know experienced similar sharp sekejap-sekejap pain especially when they changed positions atau baby was moving a lot, and it did settle down. Try to avoid sudden movements and maybe use a pregnancy pillow to support your bump better when sleeping, sometimes lying flat or the position itself aggravates it. If the pain gets worse, becomes constant, or you notice any bleeding atau spotting, definitely go back to the clinic atau hospital cepat-cepat, but from what you're describing, sounds more like normal growing pains, dear.