Sono said girl harmony test says boy? Help

Gina
I'm all sorts of confused! Had 2 different sonograms where they said girl, had to get the harmony test done due to genetics issues.... test says boy! I saw my ob today and I'm measuring 6 weeks ahead of schedule. So now they think it might be twins! Ahhhhh! I just want a definite answer. Has anyone had something like this happen?