21 week ultrasound questions

Jacquelynn

How sure can you be at 21 weeks for gender ultrasound. I went (I'm 26 weeks not ) and tech said 100% boy I even had her double check but they dont print the potty shot so been having nightmares of him being a girl even tho ultrasound and heart rate all say boy. Next appointment I go for 30 week ultrasound and getting a picture. Am I just being over worried? This is my 1st boy that I've wanted so bad I have two girls