Has anyone used one and gotten a neg but been pregnant? My story... Was late for af, no cramps or any signs, which is unusual cos im always in loads of pain and heavy bright red blood. On day 4 of being late i started to loose like brown blood. So I refused to believe it was my af. Took a test i got from work, clearview hcg and it was neg. So went to the doctors and she said because i tested neg i should assume the brown discharge is my period. But i know my own body and its not 'my' period. Got the brown stuff for 6 day, so if its wasnt my period then id be 8 days late now. Was wondering if the hospital tests are sensitive or not. Still no pains or red blood. Makes no sense to me.