Can a panorama be wrong?

I got the call a week ago the i am going to have a baby boy I was soooooo happy but some family members keep telling me they think the test was wrong and it's actually a girl... little background never been pregnant so I don't know how y would be found in the blood sample. I'm just so worried if it's a girl why did the the doc say that the baby was a boy what If something is wrong. Freakin out a bit maybe it's just my hormones making me so anxious.