Positive hpt negative blood test, what’s going on?

Okay guys, so I got four faint positive hpt and I went ahead and scheduled my first prenatal appointment, the doctor ordered me a blood test just to confirm my pregnancy and to see how far along I am but when she called me this morning she told me my results were negative bc it showed a 3.0 and they consider anything under 3.1 a negative, I am very upset by this news bc my hubby and I have been trying for six years!! Has anyone else gotten a negative blood test and was actually pregnant or should I not trust my hpt and trust the blood work? Help me to understand what’s going on?