5w1d negative urine at doctors!? Help:/

Ka
I'm doing my very best not to freak out, but I've had 3 positive pregnancy tests at home, and very late for period. I went to my first apt today and the very rude inconsiderate nurse came in after 30 seconds of testing my urine to blurt, " you're not pregnant" any advise or input? What do I do!? Please don't read and run.