yes me with my eldest thow i was on the depo and i was 3 and a half months pregnant and doctors home test all showed negative tell i had a scan it showed i was 3 and a half months pregnant baffled doctors and my self. so yes it can happen and im sure im not alone rare but it do happen i suggest going to the hospital and complain i no but if thats what it takes to get seen then go for it complain of adominal pain naughty i no but if thats what it takes to be seen then go for it. and tell them you feel movement as well and that your not happy hopefully they would be abble to feel it just in case it could be something else good luck and keep us posted....
I agree with Kitkat - it IS possible for a pregnancy to not be detectable on a urine test, although it's rare.
On another note, what you are feeling could very well be gas.
I think a trip to your gynecologist is in order so that you can get a definite answer.
You need to see your doctor and ask for an ultrasound to be done - that;s the only way you'll know for sure if you're pregnant or not.