Ok here we go. My girlfriend is 24 and she has always had normal periods until aoril that is the first period she ever missed then she had normal periods again until August. In August she had a pap smear and blood drawn everything checked out good. August she did not spot or have any signs,September she spotted,October she bled heavy for one day then spotted later that month,November she didn't spot at all,December she bled heavy for one day then spotted one day,she has taken three pregnancy test all have been negative,she went to her doctor and he prescribed her provera for 10 days she took pills as told and still only had light spottin for 1 day,anyone help us,by the way she stopped taking birth control pills in September thinking that was affecting her but here it is end of January and still no signs,could she be pregnant

Only her doctor would be able to confirm if she is or is not pregnant. Maybe her doctor could try a blood test if the hpt is still coming back negative.
Have their been any changes in her diet or exercise? Or has she been stressed?