around sept. 20 i had unprotected sex(and i was a virgin) he came in me a couple of times. i had my period about two weeks after that.. it came two days late and only lasted about 4days (regularly lasts 7) i took a pregnancy test just in case, then another one a week after but both were negative. the next month it came late again being short also... i should be gettin it again at the beggining of next month. but for the last couple of weeks i've been waking up with a wierd pain in my stomach and feel the need to throw up.. but never seem to. every once in a while i get a pain in my stomach then it goes away. its been hard for me to sleep lately.. and i cant lay on my stomach very much. could this be because im pregnant?? or what else could it be??