Help! So stressed about this!

I have taken 4 home pregnancy tests.. all of which turned out positive but when I went to get my urine test done at the drs they told me it was negative? I got a blood test and will find out today for sure but why would my hpt be positive (all of them) if I'm not pregnant? I really am scared of getting my hopes up and getting excited if its really truly negative. I just don't know what to think. Has anyone else gone through this or have input?