Share '2nd trimester qud screening?'

So, im so confused right now. I got my results on my 2nd trimester quad screening and the levels were high and now i need a level 2 ultrasound to check for spinal bifada. how accurate are these tests because im starting to freak out a little bit, i had a daughter 9 years ago with spinal bifada that passed away and im just nervous that they are going to find something. i hear the tests can give fa…