Relax, you didn't cause this by drinking too much tea or slipping on the stairs! It's completely chromosomal. Just get your scheduled scans done on time so you can stop googling and worrying 24/7.
Down syndrome is a chromosomal issue and age can sometimes be a factor, but anyone can have it. For your own safety and peace of mind, please discuss the screening tests (like NIPT or Double Marker) with your gynac. They will guide you best.
Ayyo, please don't worry, it is purely a genetic occurrence at the time of conception. My mother-in-law used to say to think good thoughts, but my doctor clearly explained it's all about chromosomes. Do the recommended blood tests and trust your gynac.
Down syndrome is a genetic condition caused by an extra chromosome, it's not caused by anything you ate or did. Don't blame yourself or stress. Make sure to get your NT scan and double marker test done around 11-13 weeks.
I remember crying during my NT scan thinking about this, the anxiety is so real. But please know it's not in your hands, it's just nature's cell division. Sending you so much love, your doctor's tests will help clear your mind.