Whats the reason for a negative positive home pregnancy test result?

May be too early: If you are pregnant, your HCG level is not yet high enough to the threshold that the home pregnancy test was made to detect. Many times, the HCG levels are not high enough until you have missed your period (meaning you are at least 2-3 weeks pregnant). You can do a blood test or urine test at a doctor's office (which often detects much lower levels) to confirm your pregnancy.