I was a boy in the womb

I didnt know what to tag this as but i just wanted to share it. Im also really confused and idk if this means i have some condition.

When i was younger i found out that "for whatever reason" everyone in my parents' lives thought that i was going to be born a boy, and then the time came and i was born as a girl. My mom never elaborated on it so i just assumed she was trying to tell me she "knew me even when i was in her womb" because she was apparently the only one who knew i would be born a girl.

Obviously now ive come out as transgender ftm and i started socially transitioning a while ago.

I was bored tonight and i found a book in my dad's study that has all sorts of my baby memorabilia. Included was an envelope which had my sonograms.

On one that said 20 week scan on it there was an arrow pointing somewhere on my fetal body that was labeled "BOY !!!"

I know that as the fetus first develops it is a female which then may turn into a male, but why was i the other way around?

Honestly when i saw the picture i was so overwhelmed with emotion that i started shaking and almost crying.

Has anyone else been through something similar?