Positive thoughts

I am 15 wks. So I went to the doctor for my appointment on Monday and got an AFP test done. They called me yesterday while I was at work and I called back this morning. They said the percentage for Down syndrome was slightly elevated. So I am going tomorrow to get a more thorough blood test done. I am just really nervous. I would rather be prepared but also the stress of being up in the air is killing me. The nurse said the AFP has a 30% chance of false positive but idk right now my brain is telling me that is small. Just need positive thoughts my way.