For the past few weeks ive had stomach cramps and gas that comes and goes. ive also felt nauseous and faint and run down. Ive been told by a friend that I should take a pregnancy test but i really dont think i need to. Im on the pill and ive been having my period (even though they say its not called that when on the pill) only difference is my last one only lasted 3 days instead of the normal 5 days. just wanting to know what could be wrong before going to the doctor.