SO nervous about NT scan


hello all! I am 11 weeks 6 days according to ultrasounds and ovulation (although my doctor has still been recording me as almost a week ahead based on LMP- hoping that doesn’t skew results) and I have my nuchal scan tomorrow (had blood drawn last week doctor said i would have both results tomorrow) I’ve seen baby at 8 weeks 4 days heart rate 166 everything was looking ok, then at last appointment 11 weeks we heard heart with doppler. I am 33 years old though, so while no relatives with downs syndrome etc I am absolutely paralyzed with fear that there will be something wrong with my blood and or scan tomorrow morning.

What are the odds of this does anyone know? I mostly just needed to vent - so much anxiety the first trimester, especially because if the scan goes well we plan to announce