chances are you are nor pregnant, but STD certainly are not out of the picture. really, we need more information to be able to tell what is going on. first we (medical professionals, that is) need a full list of the signs and symptoms. first things first, WHERE exactly does your abdomen hurt, can you point to the pain with one finger, second, does the pain radiate anywhere else, what is the quality of the pain, does it burn, stabbing, tearing, crushing, sharp, dull etc.
also, how severe is the pain, on a scale of 1-10, 10 being the worst pain of your life
do you feel anything else, like unexplained fainting spells, or shortness of breath. give us as much information as possible and we can venture a guess as to what is going on.
i am 99% sure you are not pregnant, but that does not mean this is something to ignore...
T.B. EMT-B