confused about pregnancy

On December 31st and January 1st I took a pregnancy and got 2 positive tests. So I made an appointment at planned Parenthood just for a confirmation and they did 2 tests that came up negative. I asked the lady to do a blood test or an ultrasound and she damn near refused. I explained to her that I haven't got my period since November. she just told me if I don't get it by my next scheduled period then to come back. I was just wondering if this has happened to anyone else.