..Am I Pregnant ?

so.. I took three home pregnancy tests, all came back positive. I made an appointment with the doctor, they took a urine test and it came back negative. the doctor pretty much told me the tests I took were probably ruined in the store and then took bloodwork. I get the results on Saturday. I've bought two more home pregnancy tests to take tonight and tomorrow morning.. has this ever happened to anyone? I'm so upset and confused. I don't know what to believe.. the wait is killing me. How can I get 3 positives and then the one the doctor uses is negative ?