Positive HPTs but negative blood test - confused!

Lauren
Hi! 
I am a little confused. Here's my story - any help would be appreciated! 
My husband and I are trying for baby #1 😍 Below are pictures of my tests. The first test (6/27) was taken 3 days late for my period. The next morning (6/28) I tested again and was shocked to find a *slightly* darker pink line. I ran to the store and got the digital!! When it read 'pregnant', I couldn't contain my excitement ... but I wanted to have a doctor confirm ASAP. I called my OB, and she set up an appt for 8 weeks & refused a blood test. I called urgent care & they assured me that they complete blood tests to confirm pregnancy. I rushed in and got my blood drawn... I was shocked when they told me my blood test came back NEGATIVE. She told me to come back in a week (practically for.ev.er.) to be tested again.  I went home and tested some more (6/28, 6/29) to find more faint lines. I haven't told my husband yet because I am unsure about the conflicting tests and don't want to worry him unnecessarily. My plan is to continue to test, with hopes of the lines becoming darker & going back to urgent care on Monday (8 days late for my period). Thoughts?