I had a doctor's appointment today and my doctor scared me for a second. she said that the test I…

I had a doctor's appointment today and my doctor scared me for a second. she said that the test I took last time I was there tested for positive for my baby to have down syndrome. And said that is not completely accurate because they had the wrong due date. For some reason they said my due date was in July when my ultrasound technician said August. But it is August she finally confirmed after 3 appointmens. I'm telling you these doctors at this ob place are slacking and confusing. Never had this issue with my other 2 pregnancy. So next visit they'll take a DNA blood test to see the gender and if it's still positive for down syndrome. This test will be 98% accurate so I'm kind of nervous