Just want to rant

I got told at 14 weeks and 3 days that I was having a girl. I also heard terrible stories of early scans being wrong or even 20 week scans being wrong and women giving birth to the opposite sex than what they were told. I have my 20 week scan on Monday and I am terrified it wont be a girl! I've got a little boy and want a girl soooo badly. I'm afraid I'll be super disappointed and may even feel slight resentment 😔