Am i still pregnant?

I'm 6 weeks and a few days. I've always gotten faint positives but they were getting darker so I wasn't concerned. Doctor says I'm fine and levels are good at my last visit. Well today I took a pregnancy test today because it's two weeks until my next appointment and it was negative! I diluted the urine on another test and it was negative too! I'm freaking out. I need this baby I want it so bad. I don't want it to leave me. Is this normal? What could be wrong? Am I miscarrying? I have no bleeding or cramps and all my symptoms are on high. Please tell me what you think.