Please answer! What would make a HPT negative if your pregnant?

Ok the brown blood you are talking about sounds like old blood. Could be left from your cycle the previous month. Yes there are false positives all the time. It is actually common. My best friend and my aunt had negative test results till they were going in top their 3rd month. My aunt thought she had a bug and the doctor thought they heard a heart beat when she was listening to her tummy. Sent her for a sonar and it was twins. So there is every chance in the world you are expecting. Honestly the best thing to do is get a blood test done to check your levels. Baby Dust