Anatomy scan..

So i have my 20week anatomy scan coming up next week and im so anxious something is going to be wrong (abnormaltalties) etc. Now i had a scan at 12weeks.. all looked good but i opted out of the screening test. The sonographer did tell me if they did see anything out of the ordinary they would have to tell me. Anyway all looked goof etc. Then i had a private early gender/well being scan at 16+5. They can also detect certain problems/abnormaltalities and it does state if any thing is seen they have to refer me to my health provider etc..it wasmt an indepth well being scan just checking organs are were should be etc. If something was wrong surely they of detected right? Iv been one of the lucky ones and had such a easy pregnancy. Barely any sickness etc. Which that worrys me. 🤷‍♀️