Confused?! Positive HPT & Negative blood work

Ja
Has anyone gotten a positive home pregnancy test and negative blood test? I'm 5 days late and got blood work done yesterday. I got the results today and blood test shows negative. I'm never late. NEVER. I'm always on time and I have really bad pregnancy symptoms. Has this happened to anyone and turned out to be pregnant still? 
I really need some hope here that I'm pregnant and just not creating enough HCG to be detected.