Getting first ultrasound today...

Ashley • Pregnant with #2 Psychologist with a love for wrestling, boxing, and being fit! ❤️❤️❤️ Family is LIFE
I'm really hoping I'm still as far along as I calculated. Has anyone ever been WAY off? For example, I'm 11 weeks today but did anyone go and find out they're really 3 weeks or more behind what you initially thought?