Someone help ASAP!!!!! plz!!!!!?

okay ive been feeling movement in my stomach. i dont know why. what could it be sometimes i dont just feel it in my stomach i feel it on my leg arm places like that but mostly in my stomach. its as if something is kicking. i dont think im pregnant cuz ive never had my boyfriend used to finger me but not anymore n when he didt he never touched himself he always kept his clothes on n i never touched him. plus i took a pregnancy test n it came out neg n i got my period. lately ive been felling tired n hungry also ive also had headaches theres been a lot going oln lately with test i have to take for summer skool n other things sometimes it makes me believe its just stress what im feeling. then again i also my b paronoid of being pregnant becauz that one of my fears. does any one know i i feel this in my stomach n stuff???