So angry!!

So I went to the doctors to do a doctors urine pregnancy test, I'm only 18 and the nurse treated me like I was just another stupid young kid. She asked me what doctors I usually go to, (as this wasn't my normal doctor I go to) and I said I was registered somewhere else, as soon as I said this, she turned nasty and just treated me so bad!! She got the test out, and said "these take 5 minutes to show up" I swear to god it hadn't even been 5 minutes, id say it was only 2 minutes or not even that, and she just said "negative, next time get a test at the other doctor" I walked out so upset and still am right now!!! Some doctors are so shocking and rude :( I took a home test and this was the result. I showed her this picture and she said it looks positive, yet she told me the doctors test was negative?? I don't get it! I'm a week late for AF (always regular) have a lot of symptoms and just feel so positive I am pregnant!!! I have never felt these symptoms in my life.. Agh :( so confused. Can't even trust some doctors these days..​