Just my own theory on sex of baby & how your dates change...
I think if your due date comes earlier at dating scan it's a boy.
And if your due date goes further in future it's a girl!
This is from my limited experience of 2 children🤣.. I'm expecting no 3 & due date changed after scan from 15th July to 10th July.. therefore I think boy.
SIL had same due date by periods (spooky) & at scan due date was 16th July - so by my theory it's a girl - & at 20 week scan they are having a girl!
Anyone else agree? I like a surprise.. but it's fun trying to predict!