Hi my name is taren... I need help... I normaly have a period during the last to first week every month this month and last month I had my period right around the fifthteenth... I have been having sex like every night... but that is not my only semptoms... my nipples are turning dark off an on they were pink and now dark purple... my stomach feels weird... I have thrown up three times in the past two weeks... my areolas have little bumps on them and they are also dark... and my lower back hurts... I have taken three pregnantcy tests and they all say negative... im on my period now... what could it be