Slight abdominal cramping. ..tender breasts .very tired .constpation. constant headaches dizziness. Lower back pain. . Well negative pregnancy test at the doc and home neg blood as well.. doc ordered an mri with contrast to check for a prolactin tumor or tumor on my propuitary gland....said that can cause pregnancy symptoms that came back fine.......anyone have any insight ehat is causing symptoms it not pregnant please help!!!!!!