so I know it's common and just me being paranoid but I need some reassurance and to get it of my…

so I know it's common and just me being paranoid but I need some reassurance and to get it of my chest. my ultrasound for the anatomy scan is Tuesday and I feel like they are going to tell me that my baby is deformed and has tons of problems with him. I never felt like this with my other kids and it worries me. I've had to be on medications during this Pregnancy and the dr says they are safe but a part of me, a huge part, feels like I'm growing a mutant baby :( it'll break my heart if he's not healthy