Good day, who has had a prenatal (biochemical) screening for fetal dev…

Good day, who has had a prenatal (biochemical) screening for fetal development defects? It's called prenatal screening, done in the first trimester. It's taken up to 14 weeks, but I took mine today at 13 weeks and 5 days. Before getting the results, bad thoughts creep into my head (I read on the internet how many girls mistakenly diagnosed).