Has anyone gone through this?

I did a blood test couple of weeks ago, dr said they were checking for 4 different things. Which I’m okay with, I know they check for bunch of different things to make sire the baby is healthy. Well one of the 4 things were Down syndrome. He called me not even a week later with the results saying that my baby has a 1 in 50 chance of having Down syndrome. Now On Monday I went do to another blood test to see if it was for sure or whatever. I’m worried and nervous about the results. I’ve talked to my BF about and it and I’ve told him that I don’t care if the baby has it, I’m just nervous about how I’m gonna react. Has anyone else ever gone through this before? Please give me some advice something. Is this common?