3 positive HPT tests at home, yet a negative at the doctor?

I took 3 tests between yesterday and today and all were positive. They were all very faint lines but I know there was a line. I am guessing that if I weren't pregnant there would be none right? Anyways, I went to the Dr. this morning to get a pregnancy test to confirm it. At first they were just going to give me a blood test so I used the restroom while the doctor was printing up paperwork. When she came back she said she decided to do both blood AND urine. So....I chugged a bottle of water and gave a sample that looked like just straight water with a tiny tint to it. The test came back negative and I am just wondering if I should go by that or the tests I took at home! I am also thinking that maybe I am too early for their brand to read. HELP! I am supposed to get the results for the blood test in the morning but I am so nervous. It broke my heart when she said I wasn't pregnant!