There were two ultrasounds on January 24th and we confirmed that it wi…

There were two ultrasounds on January 24th and we confirmed that it will be a boy. On the day of the ultrasound, I was 20 weeks 3 days according to my cycle, 21 weeks 3 days according to the KTR, but the baby weighed 22 weeks. How is this possible? All three of my pregnancies had the same due date, but now there's such a discrepancy. And they set the EDD from May 30th to June 10th. Of course, the belly in week 21 is where it is in the striped T-shirt, and in week 22-23 it is where it is in the green T-shirt ?