I had several neg tests before one came back positive,I realize how disheartening it is,once we finally found out,I was 13.5 wks.are you holding off on the test until morning,sometimes it helps. My doctor thought I was crazy,but after the 12th test,he had his answer...many in my family were like that,both of my grandmothers were told it was menopause,SURPRIZE!they were 46 and 48..stranger things have happened,a blood test will give you a HCG level,ask what it is or if there is one,good luck if you are trying to conceive.